222121221181 has 2 divisors, whose sum is σ = 222121221182. Its totient is φ = 222121221180.

The previous prime is 222121221097. The next prime is 222121221193. The reversal of 222121221181 is 181122121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190449324025 + 31671897156 = 436405^2 + 177966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121221181 is a prime.

It is a super-2 number, since 2×222121221181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121221481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060610590 + 111060610591.

It is an arithmetic number, because the mean of its divisors is an integer number (111060610591).

Almost surely, 2^222121221181 is an apocalyptic number.

It is an amenable number.

222121221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121221181 is an equidigital number, since it uses as much as digits as its factorization.

222121221181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 25.

The spelling of 222121221181 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred eighty-one".