31010400213021 has 16 divisors (see below), whose sum is σ = 45942066100800. Its totient is φ = 20673270538704.

The previous prime is 31010400212989. The next prime is 31010400213041. The reversal of 31010400213021 is 12031200401013.

31010400213021 is a `hidden beast` number, since 31 + 0 + 1 + 0 + 400 + 213 + 0 + 21 = 666.

It is not a de Polignac number, because 31010400213021 - 2⁵ = 31010400212989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31010400212985 and 31010400213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010400213041) 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, 7424826 + ... + 10823531.

It is an arithmetic number, because the mean of its divisors is an integer number (2871379131300).

Almost surely, 2^{31010400213021} is an apocalyptic number.

It is an amenable number.

31010400213021 is a deficient number, since it is larger than the sum of its proper divisors (14931665887779).

31010400213021 is a wasteful number, since it uses less digits than its factorization.

31010400213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18311305 (or 18311299 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31010400213021 its reverse (12031200401013), we get a palindrome (43041600614034).

The spelling of 31010400213021 in words is "thirty-one trillion, ten billion, four hundred million, two hundred thirteen thousand, twenty-one".