221133120121 has 2 divisors, whose sum is σ = 221133120122. Its totient is φ = 221133120120.

The previous prime is 221133120107. The next prime is 221133120139. The reversal of 221133120121 is 121021331122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213906250000 + 7226870121 = 462500^2 + 85011^2 .

It is a cyclic number.

It is not a de Polignac number, because 221133120121 - 2¹³ = 221133111929 is a prime.

It is not a weakly prime, because it can be changed into another prime (221133120181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110566560060 + 110566560061.

It is an arithmetic number, because the mean of its divisors is an integer number (110566560061).

Almost surely, 2^221133120121 is an apocalyptic number.

It is an amenable number.

221133120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221133120121 is an equidigital number, since it uses as much as digits as its factorization.

221133120121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221133120121 its reverse (121021331122), we get a palindrome (342154451243).

The spelling of 221133120121 in words is "two hundred twenty-one billion, one hundred thirty-three million, one hundred twenty thousand, one hundred twenty-one".