21012413057 has 2 divisors, whose sum is σ = 21012413058. Its totient is φ = 21012413056.

The previous prime is 21012413053. The next prime is 21012413069. The reversal of 21012413057 is 75031421012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19565295376 + 1447117681 = 139876^2 + 38041^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012413057 - 2² = 21012413053 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012413053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506206528 + 10506206529.

It is an arithmetic number, because the mean of its divisors is an integer number (10506206529).

Almost surely, 2^21012413057 is an apocalyptic number.

It is an amenable number.

21012413057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012413057 is an equidigital number, since it uses as much as digits as its factorization.

21012413057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 21012413057 its reverse (75031421012), we get a palindrome (96043834069).

The spelling of 21012413057 in words is "twenty-one billion, twelve million, four hundred thirteen thousand, fifty-seven".