225235021 has 16 divisors (see below), whose sum is σ = 263334528. Its totient is φ = 190555200.

The previous prime is 225235019. The next prime is 225235033. The reversal of 225235021 is 120532522.

225235021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 225235021 - 2¹ = 225235019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225234983 and 225235001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225235051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2670 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (16458408).

Almost surely, 2^225235021 is an apocalyptic number.

It is an amenable number.

225235021 is a deficient number, since it is larger than the sum of its proper divisors (38099507).

225235021 is a wasteful number, since it uses less digits than its factorization.

225235021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24132.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 225235021 is about 15007.8319886651. The cubic root of 225235021 is about 608.4318955248.

Adding to 225235021 its reverse (120532522), we get a palindrome (345767543).

It can be divided in two parts, 2252 and 35021, that added together give a palindrome (37273).

The spelling of 225235021 in words is "two hundred twenty-five million, two hundred thirty-five thousand, twenty-one".