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21310220 = 2251065511
BaseRepresentation
bin101000101001…
…0101100001100
31111002200010102
41101102230030
520423411340
62040430232
7346063631
oct121225414
944080112
1021310220
1111035758
127178378
1345518c9
142b8a188
151d0e215
hex1452b0c

21310220 has 12 divisors (see below), whose sum is σ = 44751504. Its totient is φ = 8524080.

The previous prime is 21310207. The next prime is 21310243. The reversal of 21310220 is 2201312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532736 + ... + 532775.

It is an arithmetic number, because the mean of its divisors is an integer number (3729292).

Almost surely, 221310220 is an apocalyptic number.

21310220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310220 is an abundant number, since it is smaller than the sum of its proper divisors (23441284).

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

21310220 is a wasteful number, since it uses less digits than its factorization.

21310220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065520 (or 1065518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21310220 is about 4616.2993837055. The cubic root of 21310220 is about 277.2443117314.

Adding to 21310220 its reverse (2201312), we get a palindrome (23511532).

The spelling of 21310220 in words is "twenty-one million, three hundred ten thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 1065511 2131022 4262044 5327555 10655110 21310220