225621030 has 64 divisors (see below), whose sum is σ = 571027968. Its totient is φ = 56939520.

The previous prime is 225621017. The next prime is 225621037. The reversal of 225621030 is 30126522.

225621030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 225620988 and 225621006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225621037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65245 + ... + 68615.

It is an arithmetic number, because the mean of its divisors is an integer number (8922312).

Almost surely, 2^225621030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225621030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285513984).

225621030 is an abundant number, since it is smaller than the sum of its proper divisors (345406938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225621030 is a wasteful number, since it uses less digits than its factorization.

225621030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 225621030 is about 15020.6867352994. The cubic root of 225621030 is about 608.7792751136.

Adding to 225621030 its reverse (30126522), we get a palindrome (255747552).

The spelling of 225621030 in words is "two hundred twenty-five million, six hundred twenty-one thousand, thirty".