721822225 has 24 divisors (see below), whose sum is σ = 949849920. Its totient is φ = 542963520.

The previous prime is 721822219. The next prime is 721822229. The reversal of 721822225 is 522228127.

It is not a de Polignac number, because 721822225 - 2²⁵ = 688267793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721822229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23287 + ... + 44563.

It is an arithmetic number, because the mean of its divisors is an integer number (39577080).

Almost surely, 2^721822225 is an apocalyptic number.

It is an amenable number.

721822225 is a deficient number, since it is larger than the sum of its proper divisors (228027695).

721822225 is a wasteful number, since it uses less digits than its factorization.

721822225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21369 (or 21364 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 721822225 is about 26866.7494312207. The cubic root of 721822225 is about 897.0364352655.

The spelling of 721822225 in words is "seven hundred twenty-one million, eight hundred twenty-two thousand, two hundred twenty-five".