31032000021 has 16 divisors (see below), whose sum is σ = 47513111040. Its totient is φ = 17817415920.

The previous prime is 31032000019. The next prime is 31032000047. The reversal of 31032000021 is 12000023013.

It is a happy number.

It is not a de Polignac number, because 31032000021 - 2¹ = 31032000019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31031999970 and 31032000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032000721) 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, 24745785 + ... + 24747038.

It is an arithmetic number, because the mean of its divisors is an integer number (2969569440).

Almost surely, 2^31032000021 is an apocalyptic number.

It is an amenable number.

31032000021 is a deficient number, since it is larger than the sum of its proper divisors (16481111019).

31032000021 is a wasteful number, since it uses less digits than its factorization.

31032000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49492856.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31032000021 its reverse (12000023013), we get a palindrome (43032023034).

The spelling of 31032000021 in words is "thirty-one billion, thirty-two million, twenty-one", and thus it is an aban number and an uban number.