253258821 has 12 divisors (see below), whose sum is σ = 375705772. Its totient is φ = 164275776.

The previous prime is 253258787. The next prime is 253258823. The reversal of 253258821 is 128852352.

253258821 is a `hidden beast` number, since 2 + 53 + 2 + 588 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 114254721 + 139004100 = 10689^2 + 11790^2 .

It is not a de Polignac number, because 253258821 - 2⁶ = 253258757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253258823) 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 11 ways as a sum of consecutive naturals, for example, 379936 + ... + 380601.

Almost surely, 2^253258821 is an apocalyptic number.

It is an amenable number.

253258821 is a deficient number, since it is larger than the sum of its proper divisors (122446951).

253258821 is a wasteful number, since it uses less digits than its factorization.

253258821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760580 (or 760577 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 253258821 is about 15914.1076092881. The cubic root of 253258821 is about 632.6859548955.

The spelling of 253258821 in words is "two hundred fifty-three million, two hundred fifty-eight thousand, eight hundred twenty-one".