225055021 has 4 divisors (see below), whose sum is σ = 225867772. Its totient is φ = 224242272.

The previous prime is 225055007. The next prime is 225055031. The reversal of 225055021 is 120550522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120550522 = 2 ⋅60275261.

It can be written as a sum of positive squares in 2 ways, for example, as 99301225 + 125753796 = 9965^2 + 11214^2 .

It is a cyclic number.

It is not a de Polignac number, because 225055021 - 2⁵ = 225054989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225054983 and 225055001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225055031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405960 + ... + 406513.

It is an arithmetic number, because the mean of its divisors is an integer number (56466943).

Almost surely, 2^225055021 is an apocalyptic number.

It is an amenable number.

225055021 is a deficient number, since it is larger than the sum of its proper divisors (812751).

225055021 is an equidigital number, since it uses as much as digits as its factorization.

225055021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812750.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 225055021 is about 15001.8339212244. The cubic root of 225055021 is about 608.2697731220.

The spelling of 225055021 in words is "two hundred twenty-five million, fifty-five thousand, twenty-one".