31013031203121 has 36 divisors (see below), whose sum is σ = 46965082447248. Its totient is φ = 18189460911600.

The previous prime is 31013031203113. The next prime is 31013031203131. The reversal of 31013031203121 is 12130213031013.

It is a happy number.

It is not a de Polignac number, because 31013031203121 - 2³ = 31013031203113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31013031203131) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44102431 + ... + 44800116.

Almost surely, 2^{31013031203121} is an apocalyptic number.

31013031203121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31013031203121 is a deficient number, since it is larger than the sum of its proper divisors (15952051244127).

31013031203121 is a wasteful number, since it uses less digits than its factorization.

31013031203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88902634 (or 88902592 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 31013031203121 its reverse (12130213031013), we get a palindrome (43143244234134).

The spelling of 31013031203121 in words is "thirty-one trillion, thirteen billion, thirty-one million, two hundred three thousand, one hundred twenty-one".