221123331220 has 48 divisors (see below), whose sum is σ = 507288297600. Its totient is φ = 80295016320.

The previous prime is 221123331199. The next prime is 221123331239. The reversal of 221123331220 is 22133321122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221123331191 and 221123331200.

It is a congruent number.

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, 552840 + ... + 864799.

It is an arithmetic number, because the mean of its divisors is an integer number (10568506200).

Almost surely, 2^221123331220 is an apocalyptic number.

221123331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221123331220 is an abundant number, since it is smaller than the sum of its proper divisors (286164966380).

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

221123331220 is a wasteful number, since it uses less digits than its factorization.

221123331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418368 (or 1418366 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221123331220 its reverse (22133321122), we get a palindrome (243256652342).

The spelling of 221123331220 in words is "two hundred twenty-one billion, one hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty".