21310065356 has 12 divisors (see below), whose sum is σ = 37307296992. Its totient is φ = 10650837648.

The previous prime is 21310065349. The next prime is 21310065367. The reversal of 21310065356 is 65356001312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037315 + ... + 1057658.

It is an arithmetic number, because the mean of its divisors is an integer number (3108941416).

Almost surely, 2^21310065356 is an apocalyptic number.

It is an amenable number.

21310065356 is a deficient number, since it is larger than the sum of its proper divisors (15997231636).

21310065356 is a wasteful number, since it uses less digits than its factorization.

21310065356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097520 (or 2097518 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

Adding to 21310065356 its reverse (65356001312), we get a palindrome (86666066668).

The spelling of 21310065356 in words is "twenty-one billion, three hundred ten million, sixty-five thousand, three hundred fifty-six".