222221321081 has 2 divisors, whose sum is σ = 222221321082. Its totient is φ = 222221321080.

The previous prime is 222221321053. The next prime is 222221321117. The reversal of 222221321081 is 180123122222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155377872400 + 66843448681 = 394180^2 + 258541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221321081 is a prime.

It is a super-2 number, since 2×222221321081² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 222221321081.

It is not a weakly prime, because it can be changed into another prime (222221321281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110660540 + 111110660541.

It is an arithmetic number, because the mean of its divisors is an integer number (111110660541).

Almost surely, 2^222221321081 is an apocalyptic number.

It is an amenable number.

222221321081 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221321081 is an equidigital number, since it uses as much as digits as its factorization.

222221321081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 222221321081 in words is "two hundred twenty-two billion, two hundred twenty-one million, three hundred twenty-one thousand, eighty-one".