222221011221220 has 36 divisors (see below), whose sum is σ = 512944863097212. Its totient is φ = 80807640443200.

The previous prime is 222221011221217. The next prime is 222221011221239. The reversal of 222221011221220 is 22122110122222.

It can be written as a sum of positive squares in 2 ways, for example, as 152546064710116 + 69674946511104 = 12350954^2 + 8347152^2 .

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 = 222221011221191 and 222221011221200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45913429651 + ... + 45913434490.

It is an arithmetic number, because the mean of its divisors is an integer number (14248468419367).

Almost surely, 2^{222221011221220} is an apocalyptic number.

222221011221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222221011221220 is an abundant number, since it is smaller than the sum of its proper divisors (290723851875992).

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

222221011221220 is a wasteful number, since it uses less digits than its factorization.

222221011221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91826864172 (or 91826864159 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222221011221220 its reverse (22122110122222), we get a palindrome (244343121343442).

The spelling of 222221011221220 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred twenty".