253336721 has 32 divisors (see below), whose sum is σ = 297838080. Its totient is φ = 213292800.

The previous prime is 253336711. The next prime is 253336739. The reversal of 253336721 is 127633352.

253336721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 253336721 - 2²⁶ = 186227857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253336711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 914435 + ... + 914711.

It is an arithmetic number, because the mean of its divisors is an integer number (9307440).

Almost surely, 2^253336721 is an apocalyptic number.

It is an amenable number.

253336721 is a deficient number, since it is larger than the sum of its proper divisors (44501359).

253336721 is a wasteful number, since it uses less digits than its factorization.

253336721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its digits is 22680, while the sum is 32.

The square root of 253336721 is about 15916.5549350354. The cubic root of 253336721 is about 632.7508176358.

The spelling of 253336721 in words is "two hundred fifty-three million, three hundred thirty-six thousand, seven hundred twenty-one".