21375148057 has 2 divisors, whose sum is σ = 21375148058. Its totient is φ = 21375148056.

The previous prime is 21375148021. The next prime is 21375148061. The reversal of 21375148057 is 75084157312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20553236496 + 821911561 = 143364^2 + 28669^2 .

It is a cyclic number.

It is not a de Polignac number, because 21375148057 - 2⁷ = 21375147929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21375148657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687574028 + 10687574029.

It is an arithmetic number, because the mean of its divisors is an integer number (10687574029).

Almost surely, 2^21375148057 is an apocalyptic number.

It is an amenable number.

21375148057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21375148057 is an equidigital number, since it uses as much as digits as its factorization.

21375148057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21375148057 in words is "twenty-one billion, three hundred seventy-five million, one hundred forty-eight thousand, fifty-seven".