225636421 has 2 divisors, whose sum is σ = 225636422. Its totient is φ = 225636420.

The previous prime is 225636401. The next prime is 225636451. The reversal of 225636421 is 124636522.

225636421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225420196 + 216225 = 15014^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 225636421 - 2⁷ = 225636293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225636401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112818210 + 112818211.

It is an arithmetic number, because the mean of its divisors is an integer number (112818211).

Almost surely, 2^225636421 is an apocalyptic number.

It is an amenable number.

225636421 is a deficient number, since it is larger than the sum of its proper divisors (1).

225636421 is an equidigital number, since it uses as much as digits as its factorization.

225636421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 31.

The square root of 225636421 is about 15021.1990533379. The cubic root of 225636421 is about 608.7931176601.

The spelling of 225636421 in words is "two hundred twenty-five million, six hundred thirty-six thousand, four hundred twenty-one".