21052250057 has 2 divisors, whose sum is σ = 21052250058. Its totient is φ = 21052250056.

The previous prime is 21052249997. The next prime is 21052250161. The reversal of 21052250057 is 75005225012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16516362256 + 4535887801 = 128516^2 + 67349^2 .

It is a cyclic number.

It is not a de Polignac number, because 21052250057 - 2²⁰ = 21051201481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21052250657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526125028 + 10526125029.

It is an arithmetic number, because the mean of its divisors is an integer number (10526125029).

Almost surely, 2^21052250057 is an apocalyptic number.

It is an amenable number.

21052250057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21052250057 is an equidigital number, since it uses as much as digits as its factorization.

21052250057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 29.

Adding to 21052250057 its reverse (75005225012), we get a palindrome (96057475069).

It can be divided in two parts, 2105225005 and 7, that added together give a palindrome (2105225012).

The spelling of 21052250057 in words is "twenty-one billion, fifty-two million, two hundred fifty thousand, fifty-seven".