221002202200121 has 4 divisors (see below), whose sum is σ = 221020372252752. Its totient is φ = 220984032147492.

The previous prime is 221002202200079. The next prime is 221002202200133. The reversal of 221002202200121 is 121002202200122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221002202200121 - 2⁶ = 221002202200057 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 221002202200121.

It is not an unprimeable number, because it can be changed into a prime (221002202200151) 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, 9085008071 + ... + 9085032396.

It is an arithmetic number, because the mean of its divisors is an integer number (55255093063188).

Almost surely, 2^{221002202200121} is an apocalyptic number.

It is an amenable number.

221002202200121 is a deficient number, since it is larger than the sum of its proper divisors (18170052631).

221002202200121 is a wasteful number, since it uses less digits than its factorization.

221002202200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18170052630.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221002202200121 its reverse (121002202200122), we get a palindrome (342004404400243).

Subtracting from 221002202200121 its reverse (121002202200122), we obtain a palindrome (99999999999999).

The spelling of 221002202200121 in words is "two hundred twenty-one trillion, two billion, two hundred two million, two hundred thousand, one hundred twenty-one".