221221102110012 has 72 divisors (see below), whose sum is σ = 574386408116976. Its totient is φ = 71737993833984.

The previous prime is 221221102109977. The next prime is 221221102110053. The reversal of 221221102110012 is 210011201122122.

221221102110012 is a `hidden beast` number, since 221 + 221 + 1 + 0 + 211 + 0 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 684493 + ... + 21045444.

Almost surely, 2^{221221102110012} is an apocalyptic number.

It is an amenable number.

221221102110012 is an abundant number, since it is smaller than the sum of its proper divisors (353165306006964).

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

221221102110012 is a wasteful number, since it uses less digits than its factorization.

221221102110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21737627 (or 21737622 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221221102110012 its reverse (210011201122122), we get a palindrome (431232303232134).

The spelling of 221221102110012 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred ten thousand, twelve".