22121322100 has 18 divisors (see below), whose sum is σ = 48003269174. Its totient is φ = 8848528800.

The previous prime is 22121322077. The next prime is 22121322103. The reversal of 22121322100 is 122312122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 97574884 + 22023747216 = 9878^2 + 148404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121322103) 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, 110606511 + ... + 110606710.

Almost surely, 2^22121322100 is an apocalyptic number.

22121322100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121322100 is an abundant number, since it is smaller than the sum of its proper divisors (25881947074).

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

22121322100 is a wasteful number, since it uses less digits than its factorization.

22121322100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221213235 (or 221213228 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22121322100 its reverse (122312122), we get a palindrome (22243634222).

The spelling of 22121322100 in words is "twenty-two billion, one hundred twenty-one million, three hundred twenty-two thousand, one hundred".