21376144057 has 2 divisors, whose sum is σ = 21376144058. Its totient is φ = 21376144056.

The previous prime is 21376143973. The next prime is 21376144061. The reversal of 21376144057 is 75044167312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11208245161 + 10167898896 = 105869^2 + 100836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21376144057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21376144067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688072028 + 10688072029.

It is an arithmetic number, because the mean of its divisors is an integer number (10688072029).

Almost surely, 2^21376144057 is an apocalyptic number.

It is an amenable number.

21376144057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21376144057 is an equidigital number, since it uses as much as digits as its factorization.

21376144057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 21376144057 in words is "twenty-one billion, three hundred seventy-six million, one hundred forty-four thousand, fifty-seven".