21054757937 has 2 divisors, whose sum is σ = 21054757938. Its totient is φ = 21054757936.

The previous prime is 21054757891. The next prime is 21054757939. The reversal of 21054757937 is 73975745012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16221588496 + 4833169441 = 127364^2 + 69521^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054757937 - 2¹⁸ = 21054495793 is a prime.

Together with 21054757939, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21054757939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527378968 + 10527378969.

It is an arithmetic number, because the mean of its divisors is an integer number (10527378969).

Almost surely, 2^21054757937 is an apocalyptic number.

It is an amenable number.

21054757937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054757937 is an equidigital number, since it uses as much as digits as its factorization.

21054757937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1852200, while the sum is 50.

The spelling of 21054757937 in words is "twenty-one billion, fifty-four million, seven hundred fifty-seven thousand, nine hundred thirty-seven".