221222101220 has 24 divisors (see below), whose sum is σ = 464616560184. Its totient is φ = 88479288576.

The previous prime is 221222101153. The next prime is 221222101223. The reversal of 221222101220 is 22101222122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25143176356 + 196078924864 = 158566^2 + 442808^2 .

It is not an unprimeable number, because it can be changed into a prime (221222101223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405587 + ... + 779066.

It is an arithmetic number, because the mean of its divisors is an integer number (19359023341).

Almost surely, 2^221222101220 is an apocalyptic number.

221222101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222101220 is an abundant number, since it is smaller than the sum of its proper divisors (243394458964).

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

221222101220 is a wasteful number, since it uses less digits than its factorization.

221222101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193999 (or 1193997 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221222101220 its reverse (22101222122), we get a palindrome (243323323342).

The spelling of 221222101220 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty".