221110122010121 has 2 divisors, whose sum is σ = 221110122010122. Its totient is φ = 221110122010120.

The previous prime is 221110122010097. The next prime is 221110122010181. The reversal of 221110122010121 is 121010221011122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181408277126521 + 39701844883600 = 13468789^2 + 6300940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221110122010121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221110122010121.

It is not a weakly prime, because it can be changed into another prime (221110122010181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555061005060 + 110555061005061.

It is an arithmetic number, because the mean of its divisors is an integer number (110555061005061).

Almost surely, 2^{221110122010121} is an apocalyptic number.

It is an amenable number.

221110122010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110122010121 is an equidigital number, since it uses as much as digits as its factorization.

221110122010121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221110122010121 its reverse (121010221011122), we get a palindrome (342120343021243).

The spelling of 221110122010121 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred twenty-two million, ten thousand, one hundred twenty-one".