31022023221 has 48 divisors (see below), whose sum is σ = 53166841728. Its totient is φ = 17707118400.

The previous prime is 31022023217. The next prime is 31022023247. The reversal of 31022023221 is 12232022013.

It is not a de Polignac number, because 31022023221 - 2² = 31022023217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31022023194 and 31022023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31022023261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1590951 + ... + 1610331.

It is an arithmetic number, because the mean of its divisors is an integer number (1107642536).

Almost surely, 2^31022023221 is an apocalyptic number.

It is an amenable number.

31022023221 is a deficient number, since it is larger than the sum of its proper divisors (22144818507).

31022023221 is an equidigital number, since it uses as much as digits as its factorization.

31022023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20344 (or 20332 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31022023221 its reverse (12232022013), we get a palindrome (43254045234).

The spelling of 31022023221 in words is "thirty-one billion, twenty-two million, twenty-three thousand, two hundred twenty-one".