31011322321 has 24 divisors (see below), whose sum is σ = 37994093280. Its totient is φ = 25168171392.

The previous prime is 31011322301. The next prime is 31011322351. The reversal of 31011322321 is 12322311013.

It is not a de Polignac number, because 31011322321 - 2⁷ = 31011322193 is a prime.

It is a super-2 number, since 2×31011322321² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (31011322301) 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 23 ways as a sum of consecutive naturals, for example, 1878921 + ... + 1895353.

It is an arithmetic number, because the mean of its divisors is an integer number (1583087220).

Almost surely, 2^31011322321 is an apocalyptic number.

It is an amenable number.

31011322321 is a deficient number, since it is larger than the sum of its proper divisors (6982770959).

31011322321 is a wasteful number, since it uses less digits than its factorization.

31011322321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18493 (or 18486 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31011322321 its reverse (12322311013), we get a palindrome (43333633334).

The spelling of 31011322321 in words is "thirty-one billion, eleven million, three hundred twenty-two thousand, three hundred twenty-one".