2211222100 has 18 divisors (see below), whose sum is σ = 4798352174. Its totient is φ = 884488800.

The previous prime is 2211222077. The next prime is 2211222103. The reversal of 2211222100 is 12221122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16112196 + 2195109904 = 4014^2 + 46852^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211222103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11056011 + ... + 11056210.

Almost surely, 2^2211222100 is an apocalyptic number.

2211222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2211222100 is an abundant number, since it is smaller than the sum of its proper divisors (2587130074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2211222100 is a wasteful number, since it uses less digits than its factorization.

2211222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22112235 (or 22112228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2211222100 is about 47023.6334198029. The cubic root of 2211222100 is about 1302.7991166387.

Adding to 2211222100 its reverse (12221122), we get a palindrome (2223443222).

The spelling of 2211222100 in words is "two billion, two hundred eleven million, two hundred twenty-two thousand, one hundred".