225407021 has 4 divisors (see below), whose sum is σ = 257608032. Its totient is φ = 193206012.

The previous prime is 225406999. The next prime is 225407023. The reversal of 225407021 is 120704522.

It is a happy number.

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 225407021 - 2¹⁴ = 225390637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225407023) 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, 16100495 + ... + 16100508.

It is an arithmetic number, because the mean of its divisors is an integer number (64402008).

Almost surely, 2^225407021 is an apocalyptic number.

It is an amenable number.

225407021 is a deficient number, since it is larger than the sum of its proper divisors (32201011).

225407021 is an equidigital number, since it uses as much as digits as its factorization.

225407021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32201010.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 225407021 is about 15013.5612364289. The cubic root of 225407021 is about 608.5867318054.

The spelling of 225407021 in words is "two hundred twenty-five million, four hundred seven thousand, twenty-one".