225522021 has 8 divisors (see below), whose sum is σ = 300810784. Its totient is φ = 150290640.

The previous prime is 225521987. The next prime is 225522029. The reversal of 225522021 is 120225522.

225522021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225522021 - 2⁶ = 225521957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225522029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4135 + ... + 21636.

It is an arithmetic number, because the mean of its divisors is an integer number (37601348).

Almost surely, 2^225522021 is an apocalyptic number.

It is an amenable number.

225522021 is a deficient number, since it is larger than the sum of its proper divisors (75288763).

225522021 is a wasteful number, since it uses less digits than its factorization.

225522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28691.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 225522021 is about 15017.3906188792. The cubic root of 225522021 is about 608.6902121302.

Adding to 225522021 its reverse (120225522), we get a palindrome (345747543).

The spelling of 225522021 in words is "two hundred twenty-five million, five hundred twenty-two thousand, twenty-one".