31331330121 has 32 divisors (see below), whose sum is σ = 51446644480. Its totient is φ = 16516410624.

The previous prime is 31331330117. The next prime is 31331330137. The reversal of 31331330121 is 12103313313.

It is not a de Polignac number, because 31331330121 - 2² = 31331330117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31331330101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 428295 + ... + 496083.

It is an arithmetic number, because the mean of its divisors is an integer number (1607707640).

Almost surely, 2^31331330121 is an apocalyptic number.

It is an amenable number.

31331330121 is a deficient number, since it is larger than the sum of its proper divisors (20115314359).

31331330121 is a wasteful number, since it uses less digits than its factorization.

31331330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69505.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31331330121 its reverse (12103313313), we get a palindrome (43434643434).

The spelling of 31331330121 in words is "thirty-one billion, three hundred thirty-one million, three hundred thirty thousand, one hundred twenty-one".