21303001009957 has 2 divisors, whose sum is σ = 21303001009958. Its totient is φ = 21303001009956.

The previous prime is 21303001009951. The next prime is 21303001010017. The reversal of 21303001009957 is 75990010030312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12534212656161 + 8768788353796 = 3540369^2 + 2961214^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303001009957 - 2¹¹ = 21303001007909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303001009951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651500504978 + 10651500504979.

It is an arithmetic number, because the mean of its divisors is an integer number (10651500504979).

Almost surely, 2^{21303001009957} is an apocalyptic number.

It is an amenable number.

21303001009957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303001009957 is an equidigital number, since it uses as much as digits as its factorization.

21303001009957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The spelling of 21303001009957 in words is "twenty-one trillion, three hundred three billion, one million, nine thousand, nine hundred fifty-seven".