63457021 has 2 divisors, whose sum is σ = 63457022. Its totient is φ = 63457020.

The previous prime is 63457007. The next prime is 63457057. The reversal of 63457021 is 12075436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47416996 + 16040025 = 6886^2 + 4005^2 .

It is a cyclic number.

It is not a de Polignac number, because 63457021 - 2⁵ = 63456989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63457001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31728510 + 31728511.

It is an arithmetic number, because the mean of its divisors is an integer number (31728511).

Almost surely, 2^63457021 is an apocalyptic number.

It is an amenable number.

63457021 is a deficient number, since it is larger than the sum of its proper divisors (1).

63457021 is an equidigital number, since it uses as much as digits as its factorization.

63457021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 63457021 is about 7965.9915264831. The cubic root of 63457021 is about 398.8655795169.

It can be divided in two parts, 6345702 and 1, that added together give a triangular number (6345703 = T₃₅₆₂).

The spelling of 63457021 in words is "sixty-three million, four hundred fifty-seven thousand, twenty-one".