9120221225 has 12 divisors (see below), whose sum is σ = 11319233484. Its totient is φ = 7289622720.

The previous prime is 9120221221. The next prime is 9120221237. The reversal of 9120221225 is 5221220219.

It can be written as a sum of positive squares in 6 ways, for example, as 275194921 + 8845026304 = 16589^2 + 94048^2 .

It is not a de Polignac number, because 9120221225 - 2² = 9120221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9120221194 and 9120221203.

It is not an unprimeable number, because it can be changed into a prime (9120221221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135374 + ... + 191223.

It is an arithmetic number, because the mean of its divisors is an integer number (943269457).

Almost surely, 2^9120221225 is an apocalyptic number.

It is an amenable number.

9120221225 is a deficient number, since it is larger than the sum of its proper divisors (2199012259).

9120221225 is a wasteful number, since it uses less digits than its factorization.

9120221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327724 (or 327719 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 9120221225 is about 95499.8493454309. The cubic root of 9120221225 is about 2089.3047468818.

The spelling of 9120221225 in words is "nine billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-five".