221002222222121 has 16 divisors (see below), whose sum is σ = 232393357266048. Its totient is φ = 209759920656000.

The previous prime is 221002222222081. The next prime is 221002222222217. The reversal of 221002222222121 is 121222222200122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002222222121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221002222222321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28481255 + ... + 35400371.

It is an arithmetic number, because the mean of its divisors is an integer number (14524584829128).

Almost surely, 2^{221002222222121} is an apocalyptic number.

It is an amenable number.

221002222222121 is a deficient number, since it is larger than the sum of its proper divisors (11391135043927).

221002222222121 is a wasteful number, since it uses less digits than its factorization.

221002222222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929872.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221002222222121 its reverse (121222222200122), we get a palindrome (342224444422243).

The spelling of 221002222222121 in words is "two hundred twenty-one trillion, two billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".