21320044130057 has 2 divisors, whose sum is σ = 21320044130058. Its totient is φ = 21320044130056.

The previous prime is 21320044129987. The next prime is 21320044130101. The reversal of 21320044130057 is 75003144002312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20576938064761 + 743106065296 = 4536181^2 + 862036^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320044130057 - 2²⁸ = 21319775694601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21320044130657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660022065028 + 10660022065029.

It is an arithmetic number, because the mean of its divisors is an integer number (10660022065029).

Almost surely, 2^{21320044130057} is an apocalyptic number.

It is an amenable number.

21320044130057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320044130057 is an equidigital number, since it uses as much as digits as its factorization.

21320044130057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

Adding to 21320044130057 its reverse (75003144002312), we get a palindrome (96323188132369).

The spelling of 21320044130057 in words is "twenty-one trillion, three hundred twenty billion, forty-four million, one hundred thirty thousand, fifty-seven".