21120211011220 has 96 divisors (see below), whose sum is σ = 44981461324800. Its totient is φ = 8328604377600.

The previous prime is 21120211011187. The next prime is 21120211011223. The reversal of 21120211011220 is 2211011202112.

It is a junction number, because it is equal to n+sod(n) for n = 21120211011194 and 21120211011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211011223) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 3628275910 + ... + 3628281730.

It is an arithmetic number, because the mean of its divisors is an integer number (468556888800).

Almost surely, 2^{21120211011220} is an apocalyptic number.

21120211011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120211011220 is an abundant number, since it is smaller than the sum of its proper divisors (23861250313580).

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

21120211011220 is a wasteful number, since it uses less digits than its factorization.

21120211011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969 (or 8967 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21120211011220 its reverse (2211011202112), we get a palindrome (23331222213332).

The spelling of 21120211011220 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, eleven thousand, two hundred twenty".