21024890057 has 2 divisors, whose sum is σ = 21024890058. Its totient is φ = 21024890056.

The previous prime is 21024890039. The next prime is 21024890083. The reversal of 21024890057 is 75009842012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14947752121 + 6077137936 = 122261^2 + 77956^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024890057 - 2³⁰ = 19951148233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21024890057.

It is not a weakly prime, because it can be changed into another prime (21024890017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512445028 + 10512445029.

It is an arithmetic number, because the mean of its divisors is an integer number (10512445029).

Almost surely, 2^21024890057 is an apocalyptic number.

It is an amenable number.

21024890057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024890057 is an equidigital number, since it uses as much as digits as its factorization.

21024890057 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 21024890057 in words is "twenty-one billion, twenty-four million, eight hundred ninety thousand, fifty-seven".