21120120100220 has 24 divisors (see below), whose sum is σ = 44494863967008. Its totient is φ = 8420883896000.

The previous prime is 21120120100207. The next prime is 21120120100259. The reversal of 21120120100220 is 2200102102112.

It is a junction number, because it is equal to n+sod(n) for n = 21120120100195 and 21120120100204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1697752631 + ... + 1697765070.

It is an arithmetic number, because the mean of its divisors is an integer number (1853952665292).

Almost surely, 2^{21120120100220} is an apocalyptic number.

21120120100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120120100220 is an abundant number, since it is smaller than the sum of its proper divisors (23374743866788).

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

21120120100220 is a wasteful number, since it uses less digits than its factorization.

21120120100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395518021 (or 3395518019 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120120100220 its reverse (2200102102112), we get a palindrome (23320222202332).

The spelling of 21120120100220 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty million, one hundred thousand, two hundred twenty".