253366021 has 4 divisors (see below), whose sum is σ = 253440544. Its totient is φ = 253291500.

The previous prime is 253365967. The next prime is 253366033. The reversal of 253366021 is 120663352.

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 a cyclic number.

It is not a de Polignac number, because 253366021 - 2¹¹ = 253363973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253367021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31905 + ... + 39046.

It is an arithmetic number, because the mean of its divisors is an integer number (63360136).

Almost surely, 2^253366021 is an apocalyptic number.

It is an amenable number.

253366021 is a deficient number, since it is larger than the sum of its proper divisors (74523).

253366021 is an equidigital number, since it uses as much as digits as its factorization.

253366021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74522.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 253366021 is about 15917.4753337330. The cubic root of 253366021 is about 632.7752105784.

The spelling of 253366021 in words is "two hundred fifty-three million, three hundred sixty-six thousand, twenty-one".