31111100103021 has 16 divisors (see below), whose sum is σ = 42819726758400. Its totient is φ = 20071608053760.

The previous prime is 31111100103007. The next prime is 31111100103023. The reversal of 31111100103021 is 12030100111113.

It is a de Polignac number, because none of the positive numbers 2^k-31111100103021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111100103023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52038805 + ... + 52633253.

It is an arithmetic number, because the mean of its divisors is an integer number (2676232922400).

Almost surely, 2^{31111100103021} is an apocalyptic number.

31111100103021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31111100103021 is a deficient number, since it is larger than the sum of its proper divisors (11708626655379).

31111100103021 is a wasteful number, since it uses less digits than its factorization.

31111100103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157236.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 31111100103021 its reverse (12030100111113), we get a palindrome (43141200214134).

The spelling of 31111100103021 in words is "thirty-one trillion, one hundred eleven billion, one hundred million, one hundred three thousand, twenty-one".