212121212220233 has 2 divisors, whose sum is σ = 212121212220234. Its totient is φ = 212121212220232.

The previous prime is 212121212220199. The next prime is 212121212220287. The reversal of 212121212220233 is 332022212121212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113045207881984 + 99076004338249 = 10632272^2 + 9953693^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121212220233 - 2¹⁰ = 212121212219209 is a prime.

It is a super-2 number, since 2×212121212220233² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212121212225233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060606110116 + 106060606110117.

It is an arithmetic number, because the mean of its divisors is an integer number (106060606110117).

Almost surely, 2^{212121212220233} is an apocalyptic number.

It is an amenable number.

212121212220233 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121212220233 is an equidigital number, since it uses as much as digits as its factorization.

212121212220233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 212121212220233 its reverse (332022212121212), we get a palindrome (544143424341445).

The spelling of 212121212220233 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, two hundred thirty-three".