2211221225 has 24 divisors (see below), whose sum is σ = 2818340448. Its totient is φ = 1719964800.

The previous prime is 2211221209. The next prime is 2211221249. The reversal of 2211221225 is 5221221122.

2211221225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2211221225 - 2⁴ = 2211221209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211221197 and 2211221206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311162 + ... + 318188.

It is an arithmetic number, because the mean of its divisors is an integer number (117430852).

Almost surely, 2^2211221225 is an apocalyptic number.

2211221225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2211221225 is a deficient number, since it is larger than the sum of its proper divisors (607119223).

2211221225 is a wasteful number, since it uses less digits than its factorization.

2211221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385 (or 7380 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 2211221225 is about 47023.6241159696. The cubic root of 2211221225 is about 1302.7989447957.

Adding to 2211221225 its reverse (5221221122), we get a palindrome (7432442347).

It can be divided in two parts, 221122 and 1225, that multiplied together give a triangular number (270874450 = T₂₃₂₇₅).

The spelling of 2211221225 in words is "two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-five".