31101000021 has 48 divisors (see below), whose sum is σ = 55339589760. Its totient is φ = 16390408320.

The previous prime is 31101000017. The next prime is 31101000031. The reversal of 31101000021 is 12000010113.

It is not a de Polignac number, because 31101000021 - 2² = 31101000017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31100999967 and 31101000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101000031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 942835 + ... + 975263.

It is an arithmetic number, because the mean of its divisors is an integer number (1152908120).

Almost surely, 2^31101000021 is an apocalyptic number.

It is an amenable number.

31101000021 is a deficient number, since it is larger than the sum of its proper divisors (24238589739).

31101000021 is a wasteful number, since it uses less digits than its factorization.

31101000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33626 (or 33623 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31101000021 its reverse (12000010113), we get a palindrome (43101010134).

The spelling of 31101000021 in words is "thirty-one billion, one hundred one million, twenty-one", and thus it is an aban number.