253603921 has 4 divisors (see below), whose sum is σ = 253638000. Its totient is φ = 253569844.

The previous prime is 253603919. The next prime is 253603939. The reversal of 253603921 is 129306352.

253603921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 253603921 - 2¹ = 253603919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253603951) 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, 571 + ... + 22528.

It is an arithmetic number, because the mean of its divisors is an integer number (63409500).

Almost surely, 2^253603921 is an apocalyptic number.

It is an amenable number.

253603921 is a deficient number, since it is larger than the sum of its proper divisors (34079).

253603921 is a wasteful number, since it uses less digits than its factorization.

253603921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34078.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 253603921 is about 15924.9464991252. The cubic root of 253603921 is about 632.9731983624.

The spelling of 253603921 in words is "two hundred fifty-three million, six hundred three thousand, nine hundred twenty-one".