31320302121 has 24 divisors (see below), whose sum is σ = 47930730120. Its totient is φ = 19640019456.

The previous prime is 31320302081. The next prime is 31320302171. The reversal of 31320302121 is 12120302313.

31320302121 is a `hidden beast` number, since 31 + 320 + 302 + 12 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2666276496 + 28654025625 = 51636^2 + 169275^2 .

It is not a de Polignac number, because 31320302121 - 2¹⁷ = 31320171049 is a prime.

It is a super-2 number, since 2×31320302121² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31320302094 and 31320302103.

It is not an unprimeable number, because it can be changed into a prime (31320302171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194031 + ... + 316683.

It is an arithmetic number, because the mean of its divisors is an integer number (1997113755).

Almost surely, 2^31320302121 is an apocalyptic number.

It is an amenable number.

31320302121 is a deficient number, since it is larger than the sum of its proper divisors (16610427999).

31320302121 is a wasteful number, since it uses less digits than its factorization.

31320302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124345 (or 124342 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31320302121 its reverse (12120302313), we get a palindrome (43440604434).

The spelling of 31320302121 in words is "thirty-one billion, three hundred twenty million, three hundred two thousand, one hundred twenty-one".