220121233 has 2 divisors, whose sum is σ = 220121234. Its totient is φ = 220121232.

The previous prime is 220121203. The next prime is 220121273. The reversal of 220121233 is 332121022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209178369 + 10942864 = 14463^2 + 3308^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121233 - 2¹³ = 220113041 is a prime.

It is not a weakly prime, because it can be changed into another prime (220121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060616 + 110060617.

It is an arithmetic number, because the mean of its divisors is an integer number (110060617).

Almost surely, 2^220121233 is an apocalyptic number.

It is an amenable number.

220121233 is a deficient number, since it is larger than the sum of its proper divisors (1).

220121233 is an equidigital number, since it uses as much as digits as its factorization.

220121233 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 16.

The square root of 220121233 is about 14836.4831749306. The cubic root of 220121233 is about 603.7919412986.

Adding to 220121233 its reverse (332121022), we get a palindrome (552242255).

The spelling of 220121233 in words is "two hundred twenty million, one hundred twenty-one thousand, two hundred thirty-three".