264393021 has 4 divisors (see below), whose sum is σ = 352524032. Its totient is φ = 176262012.

The previous prime is 264393011. The next prime is 264393023. The reversal of 264393021 is 120393462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 264393021 - 2⁶ = 264392957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 264393021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264393023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44065501 + ... + 44065506.

It is an arithmetic number, because the mean of its divisors is an integer number (88131008).

Almost surely, 2^264393021 is an apocalyptic number.

It is an amenable number.

264393021 is a deficient number, since it is larger than the sum of its proper divisors (88131011).

264393021 is an equidigital number, since it uses as much as digits as its factorization.

264393021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88131010.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 264393021 is about 16260.1666965625. The cubic root of 264393021 is about 641.8250486492.

The spelling of 264393021 in words is "two hundred sixty-four million, three hundred ninety-three thousand, twenty-one".