221221102021110 has 80 divisors (see below), whose sum is σ = 598627746761616. Its totient is φ = 58616546743872.

The previous prime is 221221102021091. The next prime is 221221102021133. The reversal of 221221102021110 is 11120201122122.

221221102021110 is a `hidden beast` number, since 2 + 212 + 211 + 0 + 20 + 211 + 10 = 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 39 ways as a sum of consecutive naturals, for example, 869657772 + ... + 869912111.

Almost surely, 2^{221221102021110} is an apocalyptic number.

221221102021110 is an abundant number, since it is smaller than the sum of its proper divisors (377406644740506).

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

221221102021110 is a wasteful number, since it uses less digits than its factorization.

221221102021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739570059 (or 1739570050 counting only the distinct ones).

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

Adding to 221221102021110 its reverse (11120201122122), we get a palindrome (232341303143232).

The spelling of 221221102021110 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred two million, twenty-one thousand, one hundred ten".