21222102100120 has 16 divisors (see below), whose sum is σ = 47749729725360. Its totient is φ = 8488840840032.

The previous prime is 21222102100117. The next prime is 21222102100141. The reversal of 21222102100120 is 2100120122212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21222102100094 and 21222102100103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265276276212 + ... + 265276276291.

It is an arithmetic number, because the mean of its divisors is an integer number (2984358107835).

Almost surely, 2^{21222102100120} is an apocalyptic number.

21222102100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222102100120 is an abundant number, since it is smaller than the sum of its proper divisors (26527627625240).

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

21222102100120 is a wasteful number, since it uses less digits than its factorization.

21222102100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530552552514 (or 530552552510 counting only the distinct ones).

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

Adding to 21222102100120 its reverse (2100120122212), we get a palindrome (23322222222332).

The spelling of 21222102100120 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, one hundred thousand, one hundred twenty".