225124721 has 2 divisors, whose sum is σ = 225124722. Its totient is φ = 225124720.

The previous prime is 225124663. The next prime is 225124751. The reversal of 225124721 is 127421522.

225124721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113188321 + 111936400 = 10639^2 + 10580^2 .

It is a cyclic number.

It is not a de Polignac number, because 225124721 - 2¹⁰ = 225123697 is a prime.

It is a super-2 number, since 2×225124721² = 101362280010655682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (225124751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112562360 + 112562361.

It is an arithmetic number, because the mean of its divisors is an integer number (112562361).

Almost surely, 2^225124721 is an apocalyptic number.

It is an amenable number.

225124721 is a deficient number, since it is larger than the sum of its proper divisors (1).

225124721 is an equidigital number, since it uses as much as digits as its factorization.

225124721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 26.

The square root of 225124721 is about 15004.1567907030. The cubic root of 225124721 is about 608.3325607713.

The spelling of 225124721 in words is "two hundred twenty-five million, one hundred twenty-four thousand, seven hundred twenty-one".