63673021 has 2 divisors, whose sum is σ = 63673022. Its totient is φ = 63673020.

The previous prime is 63672997. The next prime is 63673033. The reversal of 63673021 is 12037636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 6125625 = 7586^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 63673021 - 2⁹ = 63672509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63673061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31836510 + 31836511.

It is an arithmetic number, because the mean of its divisors is an integer number (31836511).

Almost surely, 2^63673021 is an apocalyptic number.

It is an amenable number.

63673021 is a deficient number, since it is larger than the sum of its proper divisors (1).

63673021 is an equidigital number, since it uses as much as digits as its factorization.

63673021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 63673021 is about 7979.5376432473. The cubic root of 63673021 is about 399.3176303411.

The spelling of 63673021 in words is "sixty-three million, six hundred seventy-three thousand, twenty-one".