2222121100 has 18 divisors (see below), whose sum is σ = 4822003004. Its totient is φ = 888848400.

The previous prime is 2222121091. The next prime is 2222121107. The reversal of 2222121100 is 11212222.

It is a happy number.

It is a super-4 number, since 4×2222121100⁴ (a number of 38 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2222121107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11110506 + ... + 11110705.

Almost surely, 2^2222121100 is an apocalyptic number.

2222121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2222121100 is an abundant number, since it is smaller than the sum of its proper divisors (2599881904).

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

2222121100 is a wasteful number, since it uses less digits than its factorization.

2222121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22221225 (or 22221218 counting only the distinct ones).

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

The square root of 2222121100 is about 47139.3795037652. The cubic root of 2222121100 is about 1304.9360860836.

Adding to 2222121100 its reverse (11212222), we get a palindrome (2233333322).

The spelling of 2222121100 in words is "two billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred".