31321010021 has 8 divisors (see below), whose sum is σ = 35802052800. Its totient is φ = 26841620448.

The previous prime is 31321010011. The next prime is 31321010027. The reversal of 31321010021 is 12001012313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31321010021 - 2³⁰ = 30247268197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321009978 and 31321010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321010027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372431 + ... + 448716.

It is an arithmetic number, because the mean of its divisors is an integer number (4475256600).

Almost surely, 2^31321010021 is an apocalyptic number.

It is an amenable number.

31321010021 is a deficient number, since it is larger than the sum of its proper divisors (4481042779).

31321010021 is an equidigital number, since it uses as much as digits as its factorization.

31321010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826603.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31321010021 its reverse (12001012313), we get a palindrome (43322022334).

The spelling of 31321010021 in words is "thirty-one billion, three hundred twenty-one million, ten thousand, twenty-one".