21151301305457 has 2 divisors, whose sum is σ = 21151301305458. Its totient is φ = 21151301305456.

The previous prime is 21151301305423. The next prime is 21151301305513. The reversal of 21151301305457 is 75450310315112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17909155350241 + 3242145955216 = 4231921^2 + 1800596^2 .

It is a cyclic number.

It is not a de Polignac number, because 21151301305457 - 2⁸ = 21151301305201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21151301305457.

It is not a weakly prime, because it can be changed into another prime (21151301305957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575650652728 + 10575650652729.

It is an arithmetic number, because the mean of its divisors is an integer number (10575650652729).

Almost surely, 2^{21151301305457} is an apocalyptic number.

It is an amenable number.

21151301305457 is a deficient number, since it is larger than the sum of its proper divisors (1).

21151301305457 is an equidigital number, since it uses as much as digits as its factorization.

21151301305457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 21151301305457 in words is "twenty-one trillion, one hundred fifty-one billion, three hundred one million, three hundred five thousand, four hundred fifty-seven".