221220120121110 has 48 divisors (see below), whose sum is σ = 627460704346320. Its totient is φ = 53629120029120.

The previous prime is 221220120121109. The next prime is 221220120121141. The reversal of 221220120121110 is 11121021022122.

221220120121110 is a `hidden beast` number, since 2 + 21 + 220 + 1 + 201 + 211 + 10 = 666.

221220120121110 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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, 111727332405 + ... + 111727334384.

It is an arithmetic number, because the mean of its divisors is an integer number (13072098007215).

Almost surely, 2^{221220120121110} is an apocalyptic number.

221220120121110 is an abundant number, since it is smaller than the sum of its proper divisors (406240584225210).

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

221220120121110 is a wasteful number, since it uses less digits than its factorization.

221220120121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223454666813 (or 223454666810 counting only the distinct ones).

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

Adding to 221220120121110 its reverse (11121021022122), we get a palindrome (232341141143232).

The spelling of 221220120121110 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty million, one hundred twenty-one thousand, one hundred ten".