64197421 has 2 divisors, whose sum is σ = 64197422. Its totient is φ = 64197420.

The previous prime is 64197407. The next prime is 64197433. The reversal of 64197421 is 12479146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 11634921 = 7250^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 64197421 - 2¹⁹ = 63673133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64197451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32098710 + 32098711.

It is an arithmetic number, because the mean of its divisors is an integer number (32098711).

Almost surely, 2^64197421 is an apocalyptic number.

It is an amenable number.

64197421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64197421 is an equidigital number, since it uses as much as digits as its factorization.

64197421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 64197421 is about 8012.3293117545. The cubic root of 64197421 is about 400.4108715669.

The spelling of 64197421 in words is "sixty-four million, one hundred ninety-seven thousand, four hundred twenty-one".