21120311112 has 16 divisors (see below), whose sum is σ = 52800777840. Its totient is φ = 7040103696.

The previous prime is 21120311101. The next prime is 21120311153. The reversal of 21120311112 is 21111302112.

It is a junction number, because it is equal to n+sod(n) for n = 21120311091 and 21120311100.

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, 440006458 + ... + 440006505.

It is an arithmetic number, because the mean of its divisors is an integer number (3300048615).

Almost surely, 2^21120311112 is an apocalyptic number.

It is an amenable number.

21120311112 is an abundant number, since it is smaller than the sum of its proper divisors (31680466728).

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

21120311112 is a wasteful number, since it uses less digits than its factorization.

21120311112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880012972 (or 880012968 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21120311112 its reverse (21111302112), we get a palindrome (42231613224).

The spelling of 21120311112 in words is "twenty-one billion, one hundred twenty million, three hundred eleven thousand, one hundred twelve".