1221000120233 has 2 divisors, whose sum is σ = 1221000120234. Its totient is φ = 1221000120232.

The previous prime is 1221000120203. The next prime is 1221000120247. The reversal of 1221000120233 is 3320210001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181334219664 + 39665900569 = 1086892^2 + 199163^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221000120233 - 2³⁰ = 1219926378409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221000120203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610500060116 + 610500060117.

It is an arithmetic number, because the mean of its divisors is an integer number (610500060117).

Almost surely, 2^{1221000120233} is an apocalyptic number.

It is an amenable number.

1221000120233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000120233 is an equidigital number, since it uses as much as digits as its factorization.

1221000120233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1221000120233 its reverse (3320210001221), we get a palindrome (4541210121454).

The spelling of 1221000120233 in words is "one trillion, two hundred twenty-one billion, one hundred twenty thousand, two hundred thirty-three".