421225251 has 4 divisors (see below), whose sum is σ = 561633672. Its totient is φ = 280816832.

The previous prime is 421225229. The next prime is 421225331. The reversal of 421225251 is 152522124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421225251 - 2⁶ = 421225187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421225451) 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, 70204206 + ... + 70204211.

It is an arithmetic number, because the mean of its divisors is an integer number (140408418).

Almost surely, 2^421225251 is an apocalyptic number.

421225251 is a deficient number, since it is larger than the sum of its proper divisors (140408421).

421225251 is a wasteful number, since it uses less digits than its factorization.

421225251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140408420.

The product of its digits is 1600, while the sum is 24.

The square root of 421225251 is about 20523.7728256771. The cubic root of 421225251 is about 749.6147657155.

Adding to 421225251 its reverse (152522124), we get a palindrome (573747375).

The spelling of 421225251 in words is "four hundred twenty-one million, two hundred twenty-five thousand, two hundred fifty-one".