225570421 has 4 divisors (see below), whose sum is σ = 225611500. Its totient is φ = 225529344.

The previous prime is 225570419. The next prime is 225570431. The reversal of 225570421 is 124075522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124075522 = 2 ⋅62037761.

It can be written as a sum of positive squares in 2 ways, for example, as 124567921 + 101002500 = 11161^2 + 10050^2 .

It is a cyclic number.

It is not a de Polignac number, because 225570421 - 2¹ = 225570419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225570421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225570431) 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, 10746 + ... + 23803.

It is an arithmetic number, because the mean of its divisors is an integer number (56402875).

Almost surely, 2^225570421 is an apocalyptic number.

It is an amenable number.

225570421 is a deficient number, since it is larger than the sum of its proper divisors (41079).

225570421 is an equidigital number, since it uses as much as digits as its factorization.

225570421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41078.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 225570421 is about 15019.0019974697. The cubic root of 225570421 is about 608.7337533313.

The spelling of 225570421 in words is "two hundred twenty-five million, five hundred seventy thousand, four hundred twenty-one".