2257790421 has 4 divisors (see below), whose sum is σ = 3010387232. Its totient is φ = 1505193612.

The previous prime is 2257790411. The next prime is 2257790429. The reversal of 2257790421 is 1240977522.

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 not a de Polignac number, because 2257790421 - 2²⁵ = 2224235989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2257790421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2257790429) 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, 376298401 + ... + 376298406.

It is an arithmetic number, because the mean of its divisors is an integer number (752596808).

Almost surely, 2^2257790421 is an apocalyptic number.

It is an amenable number.

2257790421 is a deficient number, since it is larger than the sum of its proper divisors (752596811).

2257790421 is an equidigital number, since it uses as much as digits as its factorization.

2257790421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752596810.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 2257790421 is about 47516.2121912090. The cubic root of 2257790421 is about 1311.8813015772.

The spelling of 2257790421 in words is "two billion, two hundred fifty-seven million, seven hundred ninety thousand, four hundred twenty-one".