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22221012 = 22311712371
BaseRepresentation
bin101010011000…
…1000011010100
31112210221111110
41110301003110
521142033022
62112135020
7356606202
oct124610324
945727443
1022221012
11115a7a80
127537470
1347b0338
142d46072
151e3e00c
hex15310d4

22221012 has 48 divisors (see below), whose sum is σ = 57383424. Its totient is φ = 6636000.

The previous prime is 22221007. The next prime is 22221029. The reversal of 22221012 is 21012222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8187 + ... + 10557.

It is an arithmetic number, because the mean of its divisors is an integer number (1195488).

Almost surely, 222221012 is an apocalyptic number.

22221012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28691712).

22221012 is an abundant number, since it is smaller than the sum of its proper divisors (35162412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22221012 is a wasteful number, since it uses less digits than its factorization.

22221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460 (or 2458 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22221012 is about 4713.9168427116. The cubic root of 22221012 is about 281.1391179698.

Adding to 22221012 its reverse (21012222), we get a palindrome (43233234).

It can be divided in two parts, 222210 and 12, that added together give a palindrome (222222).

The spelling of 22221012 in words is "twenty-two million, two hundred twenty-one thousand, twelve".

Divisors: 1 2 3 4 6 11 12 22 33 44 66 71 132 142 213 284 426 781 852 1562 2343 2371 3124 4686 4742 7113 9372 9484 14226 26081 28452 52162 78243 104324 156486 168341 312972 336682 505023 673364 1010046 1851751 2020092 3703502 5555253 7407004 11110506 22221012