233211312221 has 2 divisors, whose sum is σ = 233211312222. Its totient is φ = 233211312220.

The previous prime is 233211312209. The next prime is 233211312239. The reversal of 233211312221 is 122213112332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127595412025 + 105615900196 = 357205^2 + 324986^2 .

It is a cyclic number.

It is not a de Polignac number, because 233211312221 - 2¹⁸ = 233211050077 is a prime.

It is a super-2 number, since 2×233211312221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233211312251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116605656110 + 116605656111.

It is an arithmetic number, because the mean of its divisors is an integer number (116605656111).

Almost surely, 2^233211312221 is an apocalyptic number.

It is an amenable number.

233211312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

233211312221 is an equidigital number, since it uses as much as digits as its factorization.

233211312221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

Adding to 233211312221 its reverse (122213112332), we get a palindrome (355424424553).

The spelling of 233211312221 in words is "two hundred thirty-three billion, two hundred eleven million, three hundred twelve thousand, two hundred twenty-one".