21112212100122 has 128 divisors (see below), whose sum is σ = 56462474960640. Its totient is φ = 5761476864000.

The previous prime is 21112212100117. The next prime is 21112212100151. The reversal of 21112212100122 is 22100121221112.

21112212100122 is a `hidden beast` number, since 2 + 111 + 221 + 210 + 0 + 122 = 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 = 21112212100095 and 21112212100104.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33025279 + ... + 33658482.

It is an arithmetic number, because the mean of its divisors is an integer number (441113085630).

Almost surely, 2^{21112212100122} is an apocalyptic number.

21112212100122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21112212100122 is an abundant number, since it is smaller than the sum of its proper divisors (35350262860518).

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

21112212100122 is a wasteful number, since it uses less digits than its factorization.

21112212100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66683837 (or 66683831 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112212100122 its reverse (22100121221112), we get a palindrome (43212333321234).

The spelling of 21112212100122 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, one hundred thousand, one hundred twenty-two".