21102111120120 has 32 divisors (see below), whose sum is σ = 63306333360720. Its totient is φ = 5627229632000.

The previous prime is 21102111120073. The next prime is 21102111120121. The reversal of 21102111120120 is 2102111120112.

It is a happy number.

It is a super-2 number, since 2×21102111120120² (a number of 27 digits) contains 22 as substring.

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 21102111120120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102111120121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87925462881 + ... + 87925463120.

Almost surely, 2^{21102111120120} is an apocalyptic number.

21102111120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102111120120 is an abundant number, since it is smaller than the sum of its proper divisors (42204222240600).

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

21102111120120 is a wasteful number, since it uses less digits than its factorization.

21102111120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175850926015 (or 175850926011 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102111120120 its reverse (2102111120112), we get a palindrome (23204222240232).

The spelling of 21102111120120 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty".