31113120321 has 6 divisors (see below), whose sum is σ = 44941173810. Its totient is φ = 20742080208.

The previous prime is 31113120281. The next prime is 31113120323. The reversal of 31113120321 is 12302131113.

31113120321 is a `hidden beast` number, since 31 + 1 + 1 + 312 + 0 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30919353921 + 193766400 = 175839^2 + 13920^2 .

It is not a de Polignac number, because 31113120321 - 2⁷ = 31113120193 is a prime.

It is a super-2 number, since 2×31113120321² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31113120294 and 31113120303.

It is not an unprimeable number, because it can be changed into a prime (31113120323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1728506676 + ... + 1728506693.

It is an arithmetic number, because the mean of its divisors is an integer number (7490195635).

Almost surely, 2^31113120321 is an apocalyptic number.

It is an amenable number.

31113120321 is a deficient number, since it is larger than the sum of its proper divisors (13828053489).

31113120321 is a wasteful number, since it uses less digits than its factorization.

31113120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457013375 (or 3457013372 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31113120321 its reverse (12302131113), we get a palindrome (43415251434).

The spelling of 31113120321 in words is "thirty-one billion, one hundred thirteen million, one hundred twenty thousand, three hundred twenty-one".