21011110112120 has 32 divisors (see below), whose sum is σ = 47297203203600. Its totient is φ = 8400496409088.

The previous prime is 21011110112119. The next prime is 21011110112123. The reversal of 21011110112120 is 2121101111012.

It is a junction number, because it is equal to n+sod(n) for n = 21011110112095 and 21011110112104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011110112123) 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, 123277394 + ... + 123447713.

Almost surely, 2^{21011110112120} is an apocalyptic number.

21011110112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011110112120 is an abundant number, since it is smaller than the sum of its proper divisors (26286093091480).

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

21011110112120 is a wasteful number, since it uses less digits than its factorization.

21011110112120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246727247 (or 246727243 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21011110112120 its reverse (2121101111012), we get a palindrome (23132211223132).

The spelling of 21011110112120 in words is "twenty-one trillion, eleven billion, one hundred ten million, one hundred twelve thousand, one hundred twenty".