31230111120021 has 72 divisors (see below), whose sum is σ = 52669382263680. Its totient is φ = 18274671565920.

The previous prime is 31230111120007. The next prime is 31230111120023. The reversal of 31230111120021 is 12002111103213.

31230111120021 is a `hidden beast` number, since 31 + 2 + 301 + 111 + 200 + 21 = 666.

It is not a de Polignac number, because 31230111120021 - 2¹¹ = 31230111117973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31230111119976 and 31230111120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230111120023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2935725 + ... + 8430818.

Almost surely, 2^{31230111120021} is an apocalyptic number.

It is an amenable number.

31230111120021 is a deficient number, since it is larger than the sum of its proper divisors (21439271143659).

31230111120021 is a wasteful number, since it uses less digits than its factorization.

31230111120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11366632 (or 11366586 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 31230111120021 its reverse (12002111103213), we get a palindrome (43232222223234).

The spelling of 31230111120021 in words is "thirty-one trillion, two hundred thirty billion, one hundred eleven million, one hundred twenty thousand, twenty-one".