253321621 has 8 divisors (see below), whose sum is σ = 295419200. Its totient is φ = 217132524.

The previous prime is 253321603. The next prime is 253321639. The reversal of 253321621 is 126123352.

253321621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (253321603) and next prime (253321639).

It is not a de Polignac number, because 253321621 - 2¹⁵ = 253288853 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 (253325621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368931 + ... + 369616.

It is an arithmetic number, because the mean of its divisors is an integer number (36927400).

Almost surely, 2^253321621 is an apocalyptic number.

It is an amenable number.

253321621 is a deficient number, since it is larger than the sum of its proper divisors (42097579).

253321621 is an frugal number, since it uses more digits than its factorization.

253321621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738568 (or 738554 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 253321621 is about 15916.0805790873. The cubic root of 253321621 is about 632.7382457945.

Adding to 253321621 its reverse (126123352), we get a palindrome (379444973).

The spelling of 253321621 in words is "two hundred fifty-three million, three hundred twenty-one thousand, six hundred twenty-one".