21202112112112 has 10 divisors (see below), whose sum is σ = 41079092217248. Its totient is φ = 10601056056048.

The previous prime is 21202112112079. The next prime is 21202112112113. The reversal of 21202112112112 is 21121121120212.

It is a happy number.

21202112112112 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112112112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202112112113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662566003488 + ... + 662566003519.

Almost surely, 2^{21202112112112} is an apocalyptic number.

It is an amenable number.

21202112112112 is a deficient number, since it is larger than the sum of its proper divisors (19876980105136).

21202112112112 is a wasteful number, since it uses less digits than its factorization.

21202112112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325132007015 (or 1325132007009 counting only the distinct ones).

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

Adding to 21202112112112 its reverse (21121121120212), we get a palindrome (42323233232324).

The spelling of 21202112112112 in words is "twenty-one trillion, two hundred two billion, one hundred twelve million, one hundred twelve thousand, one hundred twelve".