21113846057 has 2 divisors, whose sum is σ = 21113846058. Its totient is φ = 21113846056.

The previous prime is 21113845979. The next prime is 21113846063. The reversal of 21113846057 is 75064831112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13549891216 + 7563954841 = 116404^2 + 86971^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113846057 - 2¹⁰ = 21113845033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113846057.

It is not a weakly prime, because it can be changed into another prime (21113846357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556923028 + 10556923029.

It is an arithmetic number, because the mean of its divisors is an integer number (10556923029).

Almost surely, 2^21113846057 is an apocalyptic number.

It is an amenable number.

21113846057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113846057 is an equidigital number, since it uses as much as digits as its factorization.

21113846057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 21113846057 in words is "twenty-one billion, one hundred thirteen million, eight hundred forty-six thousand, fifty-seven".