222121221121001 has 2 divisors, whose sum is σ = 222121221121002. Its totient is φ = 222121221121000.

The previous prime is 222121221120989. The next prime is 222121221121103. The reversal of 222121221121001 is 100121122121222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143574195240025 + 78547025880976 = 11982245^2 + 8862676^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121221121001 - 2¹⁴ = 222121221104617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (222121221124001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060610560500 + 111060610560501.

It is an arithmetic number, because the mean of its divisors is an integer number (111060610560501).

Almost surely, 2^{222121221121001} is an apocalyptic number.

It is an amenable number.

222121221121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121221121001 is an equidigital number, since it uses as much as digits as its factorization.

222121221121001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 222121221121001 its reverse (100121122121222), we get a palindrome (322242343242223).

It can be divided in two parts, 222121221 and 121001, that added together give a palindrome (222242222).

The spelling of 222121221121001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one".