221332111220 has 24 divisors (see below), whose sum is σ = 507051746208. Its totient is φ = 80484404000.

The previous prime is 221332111207. The next prime is 221332111237. The reversal of 221332111220 is 22111233122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221332111192 and 221332111201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503027306 + ... + 503027745.

It is an arithmetic number, because the mean of its divisors is an integer number (21127156092).

Almost surely, 2^221332111220 is an apocalyptic number.

221332111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221332111220 is an abundant number, since it is smaller than the sum of its proper divisors (285719634988).

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

221332111220 is a wasteful number, since it uses less digits than its factorization.

221332111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006055071 (or 1006055069 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221332111220 its reverse (22111233122), we get a palindrome (243443344342).

The spelling of 221332111220 in words is "two hundred twenty-one billion, three hundred thirty-two million, one hundred eleven thousand, two hundred twenty".