31011204021 has 32 divisors (see below), whose sum is σ = 48165027840. Its totient is φ = 17379745344.

The previous prime is 31011204017. The next prime is 31011204079. The reversal of 31011204021 is 12040211013.

It is not a de Polignac number, because 31011204021 - 2² = 31011204017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011204121) 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, 5694726 + ... + 5700168.

It is an arithmetic number, because the mean of its divisors is an integer number (1505157120).

Almost surely, 2^31011204021 is an apocalyptic number.

It is an amenable number.

31011204021 is a deficient number, since it is larger than the sum of its proper divisors (17153823819).

31011204021 is a wasteful number, since it uses less digits than its factorization.

31011204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10625.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31011204021 its reverse (12040211013), we get a palindrome (43051415034).

The spelling of 31011204021 in words is "thirty-one billion, eleven million, two hundred four thousand, twenty-one".