21000131231120 has 80 divisors (see below), whose sum is σ = 48964375603200. Its totient is φ = 8376160320000.

The previous prime is 21000131230997. The next prime is 21000131231141. The reversal of 21000131231120 is 2113213100012.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39448481 + ... + 39977279.

It is an arithmetic number, because the mean of its divisors is an integer number (612054695040).

Almost surely, 2^{21000131231120} is an apocalyptic number.

21000131231120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000131231120 is an abundant number, since it is smaller than the sum of its proper divisors (27964244372080).

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

21000131231120 is a wasteful number, since it uses less digits than its factorization.

21000131231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530224 (or 530218 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21000131231120 its reverse (2113213100012), we get a palindrome (23113344331132).

The spelling of 21000131231120 in words is "twenty-one trillion, one hundred thirty-one million, two hundred thirty-one thousand, one hundred twenty".