11212321 has 2 divisors, whose sum is σ = 11212322. Its totient is φ = 11212320.

The previous prime is 11212319. The next prime is 11212343. The reversal of 11212321 is 12321211.

11212321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 876096 = 3215^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212321 - 2¹ = 11212319 is a prime.

It is a super-2 number, since 2×11212321² = 251432284414082, which contains 22 as substring.

Together with 11212319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11212351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606160 + 5606161.

It is an arithmetic number, because the mean of its divisors is an integer number (5606161).

Almost surely, 2^11212321 is an apocalyptic number.

It is an amenable number.

11212321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212321 is an equidigital number, since it uses as much as digits as its factorization.

11212321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 13.

The square root of 11212321 is about 3348.4804016150. The cubic root of 11212321 is about 223.8198021974.

Adding to 11212321 its reverse (12321211), we get a palindrome (23533532).

The spelling of 11212321 in words is "eleven million, two hundred twelve thousand, three hundred twenty-one".