21231031132020 has 24 divisors (see below), whose sum is σ = 59446887169824. Its totient is φ = 5661608301856.

The previous prime is 21231031132019. The next prime is 21231031132049. The reversal of 21231031132020 is 2023113013212.

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, 176925259374 + ... + 176925259493.

It is an arithmetic number, because the mean of its divisors is an integer number (2476953632076).

Almost surely, 2^{21231031132020} is an apocalyptic number.

21231031132020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231031132020 is an abundant number, since it is smaller than the sum of its proper divisors (38215856037804).

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

21231031132020 is a wasteful number, since it uses less digits than its factorization.

21231031132020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353850518879 (or 353850518877 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21231031132020 its reverse (2023113013212), we get a palindrome (23254144145232).

The spelling of 21231031132020 in words is "twenty-one trillion, two hundred thirty-one billion, thirty-one million, one hundred thirty-two thousand, twenty".