4311121212221 has 2 divisors, whose sum is σ = 4311121212222. Its totient is φ = 4311121212220.

The previous prime is 4311121212199. The next prime is 4311121212247. The reversal of 4311121212221 is 1222121211134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2516392106596 + 1794729105625 = 1586314^2 + 1339675^2 .

It is a cyclic number.

It is not a de Polignac number, because 4311121212221 - 2¹⁰ = 4311121211197 is a prime.

It is a super-2 number, since 2×4311121212221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4311121212271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2155560606110 + 2155560606111.

It is an arithmetic number, because the mean of its divisors is an integer number (2155560606111).

Almost surely, 2^{4311121212221} is an apocalyptic number.

It is an amenable number.

4311121212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4311121212221 is an equidigital number, since it uses as much as digits as its factorization.

4311121212221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 23.

Adding to 4311121212221 its reverse (1222121211134), we get a palindrome (5533242423355).

The spelling of 4311121212221 in words is "four trillion, three hundred eleven billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".