425255021 has 4 divisors (see below), whose sum is σ = 425384544. Its totient is φ = 425125500.

The previous prime is 425255009. The next prime is 425255029. The reversal of 425255021 is 120552524.

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 a de Polignac number, because none of the positive numbers 2^k-425255021 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 (425255029) 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, 59705 + ... + 66446.

It is an arithmetic number, because the mean of its divisors is an integer number (106346136).

Almost surely, 2^425255021 is an apocalyptic number.

It is an amenable number.

425255021 is a deficient number, since it is larger than the sum of its proper divisors (129523).

425255021 is a wasteful number, since it uses less digits than its factorization.

425255021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129522.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 425255021 is about 20621.7123682782. The cubic root of 425255021 is about 751.9976498767.

The spelling of 425255021 in words is "four hundred twenty-five million, two hundred fifty-five thousand, twenty-one".