253307921 has 4 divisors (see below), whose sum is σ = 253702512. Its totient is φ = 252913332.

The previous prime is 253307911. The next prime is 253307983. The reversal of 253307921 is 129703352.

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 a de Polignac number, because none of the positive numbers 2^k-253307921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253307911) 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, 196331 + ... + 197616.

It is an arithmetic number, because the mean of its divisors is an integer number (63425628).

Almost surely, 2^253307921 is an apocalyptic number.

It is an amenable number.

253307921 is a deficient number, since it is larger than the sum of its proper divisors (394591).

253307921 is an equidigital number, since it uses as much as digits as its factorization.

253307921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394590.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 253307921 is about 15915.6501909284. The cubic root of 253307921 is about 632.7268391221.

The spelling of 253307921 in words is "two hundred fifty-three million, three hundred seven thousand, nine hundred twenty-one".