22121221100022 has 80 divisors (see below), whose sum is σ = 56920101163200. Its totient is φ = 6350589779760.

The previous prime is 22121221099931. The next prime is 22121221100029. The reversal of 22121221100022 is 22000112212122.

It is a happy number.

22121221100022 is a `hidden beast` number, since 221 + 212 + 211 + 0 + 0 + 0 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22121221099968 and 22121221100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121221100029) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 326642572 + ... + 326710287.

It is an arithmetic number, because the mean of its divisors is an integer number (711501264540).

Almost surely, 2^{22121221100022} is an apocalyptic number.

22121221100022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22121221100022 is an abundant number, since it is smaller than the sum of its proper divisors (34798880063178).

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

22121221100022 is a wasteful number, since it uses less digits than its factorization.

22121221100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653352903 (or 653352894 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22121221100022 its reverse (22000112212122), we get a palindrome (44121333312144).

The spelling of 22121221100022 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, twenty-two".