23311545221 has 2 divisors, whose sum is σ = 23311545222. Its totient is φ = 23311545220.

The previous prime is 23311545217. The next prime is 23311545251. The reversal of 23311545221 is 12254511332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11774637121 + 11536908100 = 108511^2 + 107410^2 .

It is a cyclic number.

It is not a de Polignac number, because 23311545221 - 2² = 23311545217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23311545251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11655772610 + 11655772611.

It is an arithmetic number, because the mean of its divisors is an integer number (11655772611).

Almost surely, 2^23311545221 is an apocalyptic number.

It is an amenable number.

23311545221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23311545221 is an equidigital number, since it uses as much as digits as its factorization.

23311545221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The spelling of 23311545221 in words is "twenty-three billion, three hundred eleven million, five hundred forty-five thousand, two hundred twenty-one".