21631000032 has 36 divisors (see below), whose sum is σ = 61513157160. Its totient is φ = 7210333248.

The previous prime is 21631000031. The next prime is 21631000043. The reversal of 21631000032 is 23000013612.

21631000032 is a `hidden beast` number, since 2 + 1 + 631 + 0 + 0 + 0 + 0 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21630999969 and 21631000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37553532 + ... + 37554107.

It is an arithmetic number, because the mean of its divisors is an integer number (1708698810).

Almost surely, 2^21631000032 is an apocalyptic number.

It is an amenable number.

21631000032 is an abundant number, since it is smaller than the sum of its proper divisors (39882157128).

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

21631000032 is a wasteful number, since it uses less digits than its factorization.

21631000032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75107655 (or 75107644 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21631000032 its reverse (23000013612), we get a palindrome (44631013644).

The spelling of 21631000032 in words is "twenty-one billion, six hundred thirty-one million, thirty-two", and thus it is an aban number.