225111372021 has 64 divisors (see below), whose sum is σ = 363339244800. Its totient is φ = 138929437440.

The previous prime is 225111371999. The next prime is 225111372023. The reversal of 225111372021 is 120273111522.

It is a happy number.

It is not a de Polignac number, because 225111372021 - 2²⁵ = 225077817589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225111372023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2218290 + ... + 2317548.

It is an arithmetic number, because the mean of its divisors is an integer number (5677175700).

Almost surely, 2^225111372021 is an apocalyptic number.

It is an amenable number.

225111372021 is a deficient number, since it is larger than the sum of its proper divisors (138227872779).

225111372021 is an frugal number, since it uses more digits than its factorization.

225111372021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99358 (or 99340 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 225111372021 its reverse (120273111522), we get a palindrome (345384483543).

The spelling of 225111372021 in words is "two hundred twenty-five billion, one hundred eleven million, three hundred seventy-two thousand, twenty-one".