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22110021 = 32732461
BaseRepresentation
bin101010001010…
…1111101000101
31112121022020200
41110111331011
521130010041
62105521113
7355634463
oct124257505
945538220
1022110021
111153164a
1274a3199
13477196b
142d17833
151e1b1b6
hex1515f45

22110021 has 18 divisors (see below), whose sum is σ = 32450418. Its totient is φ = 14506560.

The previous prime is 22110017. The next prime is 22110031. The reversal of 22110021 is 12001122.

It can be written as a sum of positive squares in 3 ways, for example, as 2873025 + 19236996 = 1695^2 + 4386^2 .

It is not a de Polignac number, because 22110021 - 22 = 22110017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 22109985 and 22110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22110001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47731 + ... + 48191.

It is an arithmetic number, because the mean of its divisors is an integer number (1802801).

Almost surely, 222110021 is an apocalyptic number.

It is an amenable number.

22110021 is a deficient number, since it is larger than the sum of its proper divisors (10340397).

22110021 is an equidigital number, since it uses as much as digits as its factorization.

22110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22110021 is about 4702.1294112349. The cubic root of 22110021 is about 280.6702522911.

Adding to 22110021 its reverse (12001122), we get a palindrome (34111143).

The spelling of 22110021 in words is "twenty-two million, one hundred ten thousand, twenty-one".

Divisors: 1 3 9 73 219 461 657 1383 4149 5329 15987 33653 47961 100959 302877 2456669 7370007 22110021