21631265152 has 32 divisors (see below), whose sum is σ = 49249757520. Its totient is φ = 9270541824.

The previous prime is 21631265107. The next prime is 21631265177. The reversal of 21631265152 is 25156213612.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21631265152² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12070123 + ... + 12071914.

Almost surely, 2^21631265152 is an apocalyptic number.

It is an amenable number.

21631265152 is an abundant number, since it is smaller than the sum of its proper divisors (27618492368).

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

21631265152 is an equidigital number, since it uses as much as digits as its factorization.

21631265152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24142058 (or 24142046 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

Adding to 21631265152 its reverse (25156213612), we get a palindrome (46787478764).

The spelling of 21631265152 in words is "twenty-one billion, six hundred thirty-one million, two hundred sixty-five thousand, one hundred fifty-two".