11211112321 has 2 divisors, whose sum is σ = 11211112322. Its totient is φ = 11211112320.

The previous prime is 11211112309. The next prime is 11211112333. The reversal of 11211112321 is 12321111211.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (11211112309) and next prime (11211112333).

It can be written as a sum of positive squares in only one way, i.e., 8420631696 + 2790480625 = 91764^2 + 52825^2 .

It is an emirp because it is prime and its reverse (12321111211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11211112321 - 2¹⁵ = 11211079553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211112295 and 11211112304.

It is not a weakly prime, because it can be changed into another prime (11211112301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605556160 + 5605556161.

It is an arithmetic number, because the mean of its divisors is an integer number (5605556161).

Almost surely, 2^11211112321 is an apocalyptic number.

It is an amenable number.

11211112321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211112321 is an equidigital number, since it uses as much as digits as its factorization.

11211112321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

Adding to 11211112321 its reverse (12321111211), we get a palindrome (23532223532).

The spelling of 11211112321 in words is "eleven billion, two hundred eleven million, one hundred twelve thousand, three hundred twenty-one".