22121202100 has 18 divisors (see below), whose sum is σ = 48003008774. Its totient is φ = 8848480800.

The previous prime is 22121202097. The next prime is 22121202107. The reversal of 22121202100 is 120212122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 239692324 + 21881509776 = 15482^2 + 147924^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121202107) 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, 110605911 + ... + 110606110.

Almost surely, 2^22121202100 is an apocalyptic number.

22121202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121202100 is an abundant number, since it is smaller than the sum of its proper divisors (25881806674).

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

22121202100 is a wasteful number, since it uses less digits than its factorization.

22121202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221212035 (or 221212028 counting only the distinct ones).

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

Adding to 22121202100 its reverse (120212122), we get a palindrome (22241414222).

The spelling of 22121202100 in words is "twenty-two billion, one hundred twenty-one million, two hundred two thousand, one hundred".