21221100002112 has 56 divisors (see below), whose sum is σ = 56150270362176. Its totient is φ = 7073350192128.

The previous prime is 21221100002107. The next prime is 21221100002209. The reversal of 21221100002112 is 21120000112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221100002091 and 21221100002100.

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, 1174293 + ... + 6619755.

Almost surely, 2^{21221100002112} is an apocalyptic number.

It is an amenable number.

21221100002112 is an abundant number, since it is smaller than the sum of its proper divisors (34929170360064).

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

21221100002112 is a wasteful number, since it uses less digits than its factorization.

21221100002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465775 (or 5465765 counting only the distinct ones).

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

Adding to 21221100002112 its reverse (21120000112212), we get a palindrome (42341100114324).

The spelling of 21221100002112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred million, two thousand, one hundred twelve".