222121020666065 has 4 divisors (see below), whose sum is σ = 266545224799284. Its totient is φ = 177696816532848.

The previous prime is 222121020666019. The next prime is 222121020666071. The reversal of 222121020666065 is 560666020121222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168278284172944 + 53842736493121 = 12972212^2 + 7337761^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121020666065 - 2¹⁶ = 222121020600529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22212102066602 + ... + 22212102066611.

It is an arithmetic number, because the mean of its divisors is an integer number (66636306199821).

Almost surely, 2^{222121020666065} is an apocalyptic number.

It is an amenable number.

222121020666065 is a deficient number, since it is larger than the sum of its proper divisors (44424204133219).

222121020666065 is an equidigital number, since it uses as much as digits as its factorization.

222121020666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44424204133218.

The product of its (nonzero) digits is 207360, while the sum is 41.

Adding to 222121020666065 its reverse (560666020121222), we get a palindrome (782787040787287).

The spelling of 222121020666065 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, twenty million, six hundred sixty-six thousand, sixty-five".