2551204421 has 4 divisors (see below), whose sum is σ = 2558311200. Its totient is φ = 2544097644.

The previous prime is 2551204417. The next prime is 2551204451. The reversal of 2551204421 is 1244021552.

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 2551204421 - 2² = 2551204417 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 (2551204451) 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, 3552851 + ... + 3553568.

It is an arithmetic number, because the mean of its divisors is an integer number (639577800).

Almost surely, 2^2551204421 is an apocalyptic number.

It is an amenable number.

2551204421 is a deficient number, since it is larger than the sum of its proper divisors (7106779).

2551204421 is an equidigital number, since it uses as much as digits as its factorization.

2551204421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106778.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2551204421 is about 50509.4488289073. The cubic root of 2551204421 is about 1366.4122691728.

Adding to 2551204421 its reverse (1244021552), we get a palindrome (3795225973).

The spelling of 2551204421 in words is "two billion, five hundred fifty-one million, two hundred four thousand, four hundred twenty-one".