210021010021057 has 2 divisors, whose sum is σ = 210021010021058. Its totient is φ = 210021010021056.

The previous prime is 210021010020989. The next prime is 210021010021129. The reversal of 210021010021057 is 750120010120012.

210021010021057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197409356459536 + 12611653561521 = 14050244^2 + 3551289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021010021057 is a prime.

It is not a weakly prime, because it can be changed into another prime (210021010021957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010505010528 + 105010505010529.

It is an arithmetic number, because the mean of its divisors is an integer number (105010505010529).

Almost surely, 2^{210021010021057} is an apocalyptic number.

It is an amenable number.

210021010021057 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021010021057 is an equidigital number, since it uses as much as digits as its factorization.

210021010021057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 210021010021057 its reverse (750120010120012), we get a palindrome (960141020141069).

The spelling of 210021010021057 in words is "two hundred ten trillion, twenty-one billion, ten million, twenty-one thousand, fifty-seven".