31321103432231 has 4 divisors (see below), whose sum is σ = 31322287218600. Its totient is φ = 31319919645864.

The previous prime is 31321103432219. The next prime is 31321103432249. The reversal of 31321103432231 is 13223430112313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321103432231 is a prime.

It is a super-2 number, since 2×31321103432231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321103432194 and 31321103432203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321103432831) 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, 591853496 + ... + 591906413.

It is an arithmetic number, because the mean of its divisors is an integer number (7830571804650).

Almost surely, 2^{31321103432231} is an apocalyptic number.

31321103432231 is a deficient number, since it is larger than the sum of its proper divisors (1183786369).

31321103432231 is a wasteful number, since it uses less digits than its factorization.

31321103432231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183786368.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 31321103432231 its reverse (13223430112313), we get a palindrome (44544533544544).

The spelling of 31321103432231 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred three million, four hundred thirty-two thousand, two hundred thirty-one".