264715021 has 2 divisors, whose sum is σ = 264715022. Its totient is φ = 264715020.

The previous prime is 264714943. The next prime is 264715063. The reversal of 264715021 is 120517462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245266921 + 19448100 = 15661^2 + 4410^2 .

It is a cyclic number.

It is not a de Polignac number, because 264715021 - 2⁹ = 264714509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264715081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132357510 + 132357511.

It is an arithmetic number, because the mean of its divisors is an integer number (132357511).

Almost surely, 2^264715021 is an apocalyptic number.

It is an amenable number.

264715021 is a deficient number, since it is larger than the sum of its proper divisors (1).

264715021 is an equidigital number, since it uses as much as digits as its factorization.

264715021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 264715021 is about 16270.0651811847. The cubic root of 264715021 is about 642.0854990733.

The spelling of 264715021 in words is "two hundred sixty-four million, seven hundred fifteen thousand, twenty-one".