228625021 has 2 divisors, whose sum is σ = 228625022. Its totient is φ = 228625020.

The previous prime is 228625003. The next prime is 228625051. The reversal of 228625021 is 120526822.

228625021 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., 137804121 + 90820900 = 11739^2 + 9530^2 .

It is a cyclic number.

It is not a de Polignac number, because 228625021 - 2¹⁷ = 228493949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228625051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114312510 + 114312511.

It is an arithmetic number, because the mean of its divisors is an integer number (114312511).

Almost surely, 2^228625021 is an apocalyptic number.

It is an amenable number.

228625021 is a deficient number, since it is larger than the sum of its proper divisors (1).

228625021 is an equidigital number, since it uses as much as digits as its factorization.

228625021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 228625021 is about 15120.3512194658. The cubic root of 228625021 is about 611.4691997545.

The spelling of 228625021 in words is "two hundred twenty-eight million, six hundred twenty-five thousand, twenty-one".