21001031031232 has 56 divisors (see below), whose sum is σ = 47804391807840. Its totient is φ = 8966982927360.

The previous prime is 21001031031229. The next prime is 21001031031259. The reversal of 21001031031232 is 23213013010012.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87012019 + ... + 87253042.

Almost surely, 2^{21001031031232} is an apocalyptic number.

It is an amenable number.

21001031031232 is an abundant number, since it is smaller than the sum of its proper divisors (26803360776608).

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

21001031031232 is a wasteful number, since it uses less digits than its factorization.

21001031031232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174265349 (or 174265339 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21001031031232 its reverse (23213013010012), we get a palindrome (44214044041244).

The spelling of 21001031031232 in words is "twenty-one trillion, one billion, thirty-one million, thirty-one thousand, two hundred thirty-two".