31221312011023 has 32 divisors (see below), whose sum is σ = 32590821795840. Its totient is φ = 29887087104000.

The previous prime is 31221312010997. The next prime is 31221312011027. The reversal of 31221312011023 is 32011021312213.

It is not a de Polignac number, because 31221312011023 - 2⁵ = 31221312010991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221312010985 and 31221312011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221312011027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307000743 + ... + 307102423.

It is an arithmetic number, because the mean of its divisors is an integer number (1018463181120).

Almost surely, 2^{31221312011023} is an apocalyptic number.

31221312011023 is a deficient number, since it is larger than the sum of its proper divisors (1369509784817).

31221312011023 is a wasteful number, since it uses less digits than its factorization.

31221312011023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102499.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31221312011023 its reverse (32011021312213), we get a palindrome (63232333323236).

The spelling of 31221312011023 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred twelve million, eleven thousand, twenty-three".