21110221120120 has 128 divisors (see below), whose sum is σ = 56017295193600. Its totient is φ = 7075868659200.

The previous prime is 21110221120117. The next prime is 21110221120123. The reversal of 21110221120120 is 2102112201112.

It is an interprime number because it is at equal distance from previous prime (21110221120117) and next prime (21110221120123).

It is a junction number, because it is equal to n+sod(n) for n = 21110221120094 and 21110221120103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110221120123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33814276 + ... + 34432915.

It is an arithmetic number, because the mean of its divisors is an integer number (437635118700).

Almost surely, 2^{21110221120120} is an apocalyptic number.

21110221120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110221120120 is an abundant number, since it is smaller than the sum of its proper divisors (34907074073480).

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

21110221120120 is a wasteful number, since it uses less digits than its factorization.

21110221120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68247269 (or 68247265 counting only the distinct ones).

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

Adding to 21110221120120 its reverse (2102112201112), we get a palindrome (23212333321232).

The spelling of 21110221120120 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty".