2111221225 has 6 divisors (see below), whose sum is σ = 2617914350. Its totient is φ = 1688976960.

The previous prime is 2111221219. The next prime is 2111221253. The reversal of 2111221225 is 5221221112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 167469481 + 1943751744 = 12941^2 + 44088^2 .

It is not a de Polignac number, because 2111221225 - 2⁵ = 2111221193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42224400 + ... + 42224449.

Almost surely, 2^2111221225 is an apocalyptic number.

2111221225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2111221225 is a deficient number, since it is larger than the sum of its proper divisors (506693125).

2111221225 is an equidigital number, since it uses as much as digits as its factorization.

2111221225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84448859 (or 84448854 counting only the distinct ones).

The product of its digits is 160, while the sum is 19.

The square root of 2111221225 is about 45948.0274331772. The cubic root of 2111221225 is about 1282.8560139024.

Adding to 2111221225 its reverse (5221221112), we get a palindrome (7332442337).

The spelling of 2111221225 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-five".