22121001222100 has 36 divisors (see below), whose sum is σ = 52366442895648. Its totient is φ = 8044000444000.

The previous prime is 22121001222083. The next prime is 22121001222107. The reversal of 22121001222100 is 122210012122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121001222107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10054999456 + ... + 10055001655.

It is an arithmetic number, because the mean of its divisors is an integer number (1454623413768).

Almost surely, 2^{22121001222100} is an apocalyptic number.

22121001222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121001222100 is an abundant number, since it is smaller than the sum of its proper divisors (30245441673548).

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

22121001222100 is a wasteful number, since it uses less digits than its factorization.

22121001222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20110001136 (or 20110001129 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121001222100 its reverse (122210012122), we get a palindrome (22243211234222).

The spelling of 22121001222100 in words is "twenty-two trillion, one hundred twenty-one billion, one million, two hundred twenty-two thousand, one hundred".