21100111121022 has 16 divisors (see below), whose sum is σ = 42228601696512. Its totient is φ = 7028640464600.

The previous prime is 21100111120987. The next prime is 21100111121083. The reversal of 21100111121022 is 22012111100112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21100111120992 and 21100111121010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182467604 + ... + 1182485447.

It is an arithmetic number, because the mean of its divisors is an integer number (2639287606032).

Almost surely, 2^{21100111121022} is an apocalyptic number.

21100111121022 is an abundant number, since it is smaller than the sum of its proper divisors (21128490575490).

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

21100111121022 is a wasteful number, since it uses less digits than its factorization.

21100111121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364954543.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21100111121022 its reverse (22012111100112), we get a palindrome (43112222221134).

The spelling of 21100111121022 in words is "twenty-one trillion, one hundred billion, one hundred eleven million, one hundred twenty-one thousand, twenty-two".