21001031232 has 28 divisors (see below), whose sum is σ = 55565228976. Its totient is φ = 7000343680.

The previous prime is 21001031147. The next prime is 21001031237. The reversal of 21001031232 is 23213010012.

It is not an unprimeable number, because it can be changed into a prime (21001031237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54689994 + ... + 54690377.

Almost surely, 2^21001031232 is an apocalyptic number.

It is an amenable number.

21001031232 is an abundant number, since it is smaller than the sum of its proper divisors (34564197744).

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

21001031232 is a wasteful number, since it uses less digits than its factorization.

21001031232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109380386 (or 109380376 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21001031232 its reverse (23213010012), we get a palindrome (44214041244).

The spelling of 21001031232 in words is "twenty-one billion, one million, thirty-one thousand, two hundred thirty-two".