221123233222121 has 2 divisors, whose sum is σ = 221123233222122. Its totient is φ = 221123233222120.

The previous prime is 221123233222097. The next prime is 221123233222153. The reversal of 221123233222121 is 121222332321122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118556470596496 + 102566762625625 = 10888364^2 + 10127525^2 .

It is a cyclic number.

It is not a de Polignac number, because 221123233222121 - 2¹⁸ = 221123232959977 is a prime.

It is not a weakly prime, because it can be changed into another prime (221123233222321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561616611060 + 110561616611061.

It is an arithmetic number, because the mean of its divisors is an integer number (110561616611061).

Almost surely, 2^{221123233222121} is an apocalyptic number.

It is an amenable number.

221123233222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123233222121 is an equidigital number, since it uses as much as digits as its factorization.

221123233222121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

Adding to 221123233222121 its reverse (121222332321122), we get a palindrome (342345565543243).

Subtracting from 221123233222121 its reverse (121222332321122), we obtain a palindrome (99900900900999).

The spelling of 221123233222121 in words is "two hundred twenty-one trillion, one hundred twenty-three billion, two hundred thirty-three million, two hundred twenty-two thousand, one hundred twenty-one".