21122120112 has 20 divisors (see below), whose sum is σ = 54565477080. Its totient is φ = 7040706688.

The previous prime is 21122120077. The next prime is 21122120119. The reversal of 21122120112 is 21102122112.

It is a super-2 number, since 2×21122120112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122120091 and 21122120100.

It is not an unprimeable number, because it can be changed into a prime (21122120119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220022037 + ... + 220022132.

It is an arithmetic number, because the mean of its divisors is an integer number (2728273854).

Almost surely, 2^21122120112 is an apocalyptic number.

It is an amenable number.

21122120112 is an abundant number, since it is smaller than the sum of its proper divisors (33443356968).

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

21122120112 is a wasteful number, since it uses less digits than its factorization.

21122120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440044180 (or 440044174 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122120112 its reverse (21102122112), we get a palindrome (42224242224).

The spelling of 21122120112 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred twelve".