21122112120112 has 40 divisors (see below), whose sum is σ = 43331849816256. Its totient is φ = 9939712398336.

The previous prime is 21122112120107. The next prime is 21122112120199. The reversal of 21122112120112 is 21102121122112.

It is a happy number.

It is a super-2 number, since 2×21122112120112² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122112120112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29320138 + ... + 30031894.

Almost surely, 2^{21122112120112} is an apocalyptic number.

It is an amenable number.

21122112120112 is an abundant number, since it is smaller than the sum of its proper divisors (22209737696144).

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

21122112120112 is a wasteful number, since it uses less digits than its factorization.

21122112120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820885 (or 820879 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21122112120112 its reverse (21102121122112), we get a palindrome (42224233242224).

The spelling of 21122112120112 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twenty thousand, one hundred twelve".