31221530023 has 2 divisors, whose sum is σ = 31221530024. Its totient is φ = 31221530022.

The previous prime is 31221530017. The next prime is 31221530033. The reversal of 31221530023 is 32003512213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31221530023 - 2⁹ = 31221529511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221529976 and 31221530003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221530033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610765011 + 15610765012.

It is an arithmetic number, because the mean of its divisors is an integer number (15610765012).

Almost surely, 2^31221530023 is an apocalyptic number.

31221530023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221530023 is an equidigital number, since it uses as much as digits as its factorization.

31221530023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

The spelling of 31221530023 in words is "thirty-one billion, two hundred twenty-one million, five hundred thirty thousand, twenty-three".