225671021 has 2 divisors, whose sum is σ = 225671022. Its totient is φ = 225671020.

The previous prime is 225670997. The next prime is 225671051. The reversal of 225671021 is 120176522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149108521 + 76562500 = 12211^2 + 8750^2 .

It is a cyclic number.

It is not a de Polignac number, because 225671021 - 2⁶ = 225670957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225671051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112835510 + 112835511.

It is an arithmetic number, because the mean of its divisors is an integer number (112835511).

Almost surely, 2^225671021 is an apocalyptic number.

It is an amenable number.

225671021 is a deficient number, since it is larger than the sum of its proper divisors (1).

225671021 is an equidigital number, since it uses as much as digits as its factorization.

225671021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 225671021 is about 15022.3507148515. The cubic root of 225671021 is about 608.8242343347.

The spelling of 225671021 in words is "two hundred twenty-five million, six hundred seventy-one thousand, twenty-one".