21121022100120 has 32 divisors (see below), whose sum is σ = 63363066300720. Its totient is φ = 5632272560000.

The previous prime is 21121022100103. The next prime is 21121022100127. The reversal of 21121022100120 is 2100122012112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21121022100120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121022100127) by changing a digit.

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, 88004258631 + ... + 88004258870.

Almost surely, 2^{21121022100120} is an apocalyptic number.

21121022100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121022100120 is an abundant number, since it is smaller than the sum of its proper divisors (42242044200600).

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

21121022100120 is a wasteful number, since it uses less digits than its factorization.

21121022100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176008517515 (or 176008517511 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121022100120 its reverse (2100122012112), we get a palindrome (23221144112232).

The spelling of 21121022100120 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, one hundred thousand, one hundred twenty".