31030120321 has 4 divisors (see below), whose sum is σ = 32100124500. Its totient is φ = 29960116144.

The previous prime is 31030120301. The next prime is 31030120339. The reversal of 31030120321 is 12302103013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12302103013 = 41 ⋅300051293.

It can be written as a sum of positive squares in 2 ways, for example, as 6086340225 + 24943780096 = 78015^2 + 157936^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030120321 - 2²⁵ = 30996565889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31030120295 and 31030120304.

It is not an unprimeable number, because it can be changed into a prime (31030120301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535002046 + ... + 535002103.

It is an arithmetic number, because the mean of its divisors is an integer number (8025031125).

Almost surely, 2^31030120321 is an apocalyptic number.

It is an amenable number.

31030120321 is a deficient number, since it is larger than the sum of its proper divisors (1070004179).

31030120321 is a wasteful number, since it uses less digits than its factorization.

31030120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070004178.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31030120321 its reverse (12302103013), we get a palindrome (43332223334).

The spelling of 31030120321 in words is "thirty-one billion, thirty million, one hundred twenty thousand, three hundred twenty-one".