31010130921 has 32 divisors (see below), whose sum is σ = 51672499200. Its totient is φ = 16070662080.

The previous prime is 31010130883. The next prime is 31010130929. The reversal of 31010130921 is 12903101013.

It is not a de Polignac number, because 31010130921 - 2¹¹ = 31010128873 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 (31010130929) 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, 63406 + ... + 256983.

It is an arithmetic number, because the mean of its divisors is an integer number (1614765600).

Almost surely, 2^31010130921 is an apocalyptic number.

It is an amenable number.

31010130921 is a deficient number, since it is larger than the sum of its proper divisors (20662368279).

31010130921 is a wasteful number, since it uses less digits than its factorization.

31010130921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320829.

The product of its (nonzero) digits is 162, while the sum is 21.

Adding to 31010130921 its reverse (12903101013), we get a palindrome (43913231934).

The spelling of 31010130921 in words is "thirty-one billion, ten million, one hundred thirty thousand, nine hundred twenty-one".