221002002220 has 24 divisors (see below), whose sum is σ = 473978764224. Its totient is φ = 86519932416.

The previous prime is 221002002187. The next prime is 221002002239. The reversal of 221002002220 is 22200200122.

It is a self number, because there is not a number n which added to its sum of digits gives 221002002220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117553317 + ... + 117555196.

It is an arithmetic number, because the mean of its divisors is an integer number (19749115176).

Almost surely, 2^221002002220 is an apocalyptic number.

221002002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221002002220 is an abundant number, since it is smaller than the sum of its proper divisors (252976762004).

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

221002002220 is a wasteful number, since it uses less digits than its factorization.

221002002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235108569 (or 235108567 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 221002002220 its reverse (22200200122), we get a palindrome (243202202342).

The spelling of 221002002220 in words is "two hundred twenty-one billion, two million, two thousand, two hundred twenty".