21122120112112 has 40 divisors (see below), whose sum is σ = 41795576697600. Its totient is φ = 10336172828352.

The previous prime is 21122120112103. The next prime is 21122120112127. The reversal of 21122120112112 is 21121102122112.

It is a happy number.

It is a super-2 number, since 2×21122120112112² (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 21122120112112.

It is a congruent number.

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, 48345939 + ... + 48780877.

It is an arithmetic number, because the mean of its divisors is an integer number (1044889417440).

Almost surely, 2^{21122120112112} is an apocalyptic number.

It is an amenable number.

21122120112112 is a deficient number, since it is larger than the sum of its proper divisors (20673456585488).

21122120112112 is a wasteful number, since it uses less digits than its factorization.

21122120112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499573 (or 499567 counting only the distinct ones).

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

Adding to 21122120112112 its reverse (21121102122112), we get a palindrome (42243222234224).

The spelling of 21122120112112 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty million, one hundred twelve thousand, one hundred twelve".