222121210122001 has 4 divisors (see below), whose sum is σ = 226312176350772. Its totient is φ = 217930243893232.

The previous prime is 222121210121989. The next prime is 222121210122061. The reversal of 222121210122001 is 100221012121222.

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 87495894197776 + 134625315924225 = 9353924^2 + 11602815^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121210122001 - 2⁷ = 222121210121873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222121210122001.

It is not an unprimeable number, because it can be changed into a prime (222121210122061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2095483114306 + ... + 2095483114411.

It is an arithmetic number, because the mean of its divisors is an integer number (56578044087693).

Almost surely, 2^{222121210122001} is an apocalyptic number.

It is an amenable number.

222121210122001 is a deficient number, since it is larger than the sum of its proper divisors (4190966228771).

222121210122001 is an equidigital number, since it uses as much as digits as its factorization.

222121210122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190966228770.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 222121210122001 its reverse (100221012121222), we get a palindrome (322342222243223).

The spelling of 222121210122001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred ten million, one hundred twenty-two thousand, one".