2251325021 has 4 divisors (see below), whose sum is σ = 2455990944. Its totient is φ = 2046659100.

The previous prime is 2251325003. The next prime is 2251325023. The reversal of 2251325021 is 1205231522.

2251325021 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.

It is a cyclic number.

It is not a de Polignac number, because 2251325021 - 2²⁶ = 2184216157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251325023) 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, 102332945 + ... + 102332966.

It is an arithmetic number, because the mean of its divisors is an integer number (613997736).

Almost surely, 2^2251325021 is an apocalyptic number.

It is an amenable number.

2251325021 is a deficient number, since it is larger than the sum of its proper divisors (204665923).

2251325021 is a wasteful number, since it uses less digits than its factorization.

2251325021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204665922.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2251325021 is about 47448.1297945451. The cubic root of 2251325021 is about 1310.6278716192.

Adding to 2251325021 its reverse (1205231522), we get a palindrome (3456556543).

The spelling of 2251325021 in words is "two billion, two hundred fifty-one million, three hundred twenty-five thousand, twenty-one".