21100012222122 has 96 divisors (see below), whose sum is σ = 48164111835840. Its totient is φ = 6668192643840.

The previous prime is 21100012222087. The next prime is 21100012222183. The reversal of 21100012222122 is 22122221000112.

It is a happy number.

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 = 21100012222095 and 21100012222104.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4564029 + ... + 7939167.

It is an arithmetic number, because the mean of its divisors is an integer number (501709498290).

Almost surely, 2^{21100012222122} is an apocalyptic number.

21100012222122 is an abundant number, since it is smaller than the sum of its proper divisors (27064099613718).

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

21100012222122 is a wasteful number, since it uses less digits than its factorization.

21100012222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375428 (or 3375425 counting only the distinct ones).

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

Adding to 21100012222122 its reverse (22122221000112), we get a palindrome (43222233222234).

The spelling of 21100012222122 in words is "twenty-one trillion, one hundred billion, twelve million, two hundred twenty-two thousand, one hundred twenty-two".