31221020023 has 2 divisors, whose sum is σ = 31221020024. Its totient is φ = 31221020022.

The previous prime is 31221019969. The next prime is 31221020027. The reversal of 31221020023 is 32002012213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31221020023 - 2²¹ = 31218922871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31221019979 and 31221020006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221020027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610510011 + 15610510012.

It is an arithmetic number, because the mean of its divisors is an integer number (15610510012).

Almost surely, 2^31221020023 is an apocalyptic number.

31221020023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221020023 is an equidigital number, since it uses as much as digits as its factorization.

31221020023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31221020023 its reverse (32002012213), we get a palindrome (63223032236).

It can be divided in two parts, 312210 and 20023, that added together give a palindrome (332233).

The spelling of 31221020023 in words is "thirty-one billion, two hundred twenty-one million, twenty thousand, twenty-three".