221021220112 has 80 divisors (see below), whose sum is σ = 539181811584. Its totient is φ = 85259520000.

The previous prime is 221021220109. The next prime is 221021220139. The reversal of 221021220112 is 211022120122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763689 + ... + 1012552.

Almost surely, 2^221021220112 is an apocalyptic number.

221021220112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221021220112 is an abundant number, since it is smaller than the sum of its proper divisors (318160591472).

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

221021220112 is a wasteful number, since it uses less digits than its factorization.

221021220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776368 (or 1776362 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221021220112 its reverse (211022120122), we get a palindrome (432043340234).

The spelling of 221021220112 in words is "two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred twelve".