221221100112 has 40 divisors (see below), whose sum is σ = 571509941856. Its totient is φ = 73737515136.

The previous prime is 221221100041. The next prime is 221221100141. The reversal of 221221100112 is 211001122122.

It is a junction number, because it is equal to n+sod(n) for n = 221221100091 and 221221100100.

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, 1433158 + ... + 1579994.

Almost surely, 2^221221100112 is an apocalyptic number.

It is an amenable number.

221221100112 is an abundant number, since it is smaller than the sum of its proper divisors (350288841744).

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

221221100112 is a wasteful number, since it uses less digits than its factorization.

221221100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178235 (or 178229 counting only the distinct ones).

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

Adding to 221221100112 its reverse (211001122122), we get a palindrome (432222222234).

The spelling of 221221100112 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, one hundred twelve".