221322223212220 has 48 divisors (see below), whose sum is σ = 500530426935840. Its totient is φ = 81718696071936.

The previous prime is 221322223212179. The next prime is 221322223212229. The reversal of 221322223212220 is 22212322223122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221322223212229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84777571 + ... + 87349189.

It is an arithmetic number, because the mean of its divisors is an integer number (10427717227830).

Almost surely, 2^{221322223212220} is an apocalyptic number.

221322223212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221322223212220 is an abundant number, since it is smaller than the sum of its proper divisors (279208203723620).

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

221322223212220 is a wasteful number, since it uses less digits than its factorization.

221322223212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902654 (or 2902652 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221322223212220 its reverse (22212322223122), we get a palindrome (243534545435342).

The spelling of 221322223212220 in words is "two hundred twenty-one trillion, three hundred twenty-two billion, two hundred twenty-three million, two hundred twelve thousand, two hundred twenty".