21112111121120 has 24 divisors (see below), whose sum is σ = 49877362524024. Its totient is φ = 8444844448384.

The previous prime is 21112111121089. The next prime is 21112111121137. The reversal of 21112111121120 is 2112111121112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65975347094 + ... + 65975347413.

It is an arithmetic number, because the mean of its divisors is an integer number (2078223438501).

Almost surely, 2^{21112111121120} is an apocalyptic number.

21112111121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112111121120 is an abundant number, since it is smaller than the sum of its proper divisors (28765251402904).

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

21112111121120 is a wasteful number, since it uses less digits than its factorization.

21112111121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131950694522 (or 131950694514 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21112111121120 its reverse (2112111121112), we get a palindrome (23224222242232).

The spelling of 21112111121120 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty".