222121111222001 has 4 divisors (see below), whose sum is σ = 222121355696100. Its totient is φ = 222120866747904.

The previous prime is 222121111221937. The next prime is 222121111222009. The reversal of 222121111222001 is 100222111121222.

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 140797779198976 + 81323332023025 = 11865824^2 + 9017945^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121111222001 - 2⁶ = 222121111221937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121111222009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120869096 + ... + 122693033.

It is an arithmetic number, because the mean of its divisors is an integer number (55530338924025).

Almost surely, 2^{222121111222001} is an apocalyptic number.

It is an amenable number.

222121111222001 is a deficient number, since it is larger than the sum of its proper divisors (244474099).

222121111222001 is an equidigital number, since it uses as much as digits as its factorization.

222121111222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244474098.

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

Adding to 222121111222001 its reverse (100222111121222), we get a palindrome (322343222343223).

The spelling of 222121111222001 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, one".