31221030023 has 2 divisors, whose sum is σ = 31221030024. Its totient is φ = 31221030022.

The previous prime is 31221029993. The next prime is 31221030073. The reversal of 31221030023 is 32003012213.

It is a weak prime.

It is an emirp because it is prime and its reverse (32003012213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31221030023 - 2¹⁴ = 31221013639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221029983 and 31221030010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221030073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610515011 + 15610515012.

It is an arithmetic number, because the mean of its divisors is an integer number (15610515012).

Almost surely, 2^31221030023 is an apocalyptic number.

31221030023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221030023 is an equidigital number, since it uses as much as digits as its factorization.

31221030023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31221030023 its reverse (32003012213), we get a palindrome (63224042236).

The spelling of 31221030023 in words is "thirty-one billion, two hundred twenty-one million, thirty thousand, twenty-three".