253671887621 has 4 divisors (see below), whose sum is σ = 257971411200. Its totient is φ = 249372364044.

The previous prime is 253671887591. The next prime is 253671887633. The reversal of 253671887621 is 126788176352.

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 not a de Polignac number, because 253671887621 - 2¹⁰ = 253671886597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253671887321) 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, 2149761701 + ... + 2149761818.

It is an arithmetic number, because the mean of its divisors is an integer number (64492852800).

Almost surely, 2^253671887621 is an apocalyptic number.

It is an amenable number.

253671887621 is a deficient number, since it is larger than the sum of its proper divisors (4299523579).

253671887621 is an equidigital number, since it uses as much as digits as its factorization.

253671887621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4299523578.

The product of its digits is 6773760, while the sum is 56.

The spelling of 253671887621 in words is "two hundred fifty-three billion, six hundred seventy-one million, eight hundred eighty-seven thousand, six hundred twenty-one".