21202233131957 has 2 divisors, whose sum is σ = 21202233131958. Its totient is φ = 21202233131956.

The previous prime is 21202233131939. The next prime is 21202233131977. The reversal of 21202233131957 is 75913133220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13913750452996 + 7288482678961 = 3730114^2 + 2699719^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202233131957 - 2¹⁰ = 21202233130933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202233131977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601116565978 + 10601116565979.

It is an arithmetic number, because the mean of its divisors is an integer number (10601116565979).

Almost surely, 2^{21202233131957} is an apocalyptic number.

It is an amenable number.

21202233131957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202233131957 is an equidigital number, since it uses as much as digits as its factorization.

21202233131957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 21202233131957 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-three million, one hundred thirty-one thousand, nine hundred fifty-seven".