21121021120120 has 64 divisors (see below), whose sum is σ = 48461751817920. Its totient is φ = 8282780365824.

The previous prime is 21121021120061. The next prime is 21121021120123. The reversal of 21121021120120 is 2102112012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121021120094 and 21121021120103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121021120123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21168727 + ... + 22144006.

It is an arithmetic number, because the mean of its divisors is an integer number (757214872155).

Almost surely, 2^{21121021120120} is an apocalyptic number.

21121021120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121021120120 is an abundant number, since it is smaller than the sum of its proper divisors (27340730697800).

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

21121021120120 is a wasteful number, since it uses less digits than its factorization.

21121021120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43312984 (or 43312980 counting only the distinct ones).

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

Adding to 21121021120120 its reverse (2102112012112), we get a palindrome (23223133132232).

The spelling of 21121021120120 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred twenty".