111121222321 has 2 divisors, whose sum is σ = 111121222322. Its totient is φ = 111121222320.

The previous prime is 111121222309. The next prime is 111121222327. The reversal of 111121222321 is 123222121111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109597413025 + 1523809296 = 331055^2 + 39036^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121222321 - 2⁷ = 111121222193 is a prime.

It is a super-4 number, since 4×111121222321⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (111121222327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560611160 + 55560611161.

It is an arithmetic number, because the mean of its divisors is an integer number (55560611161).

Almost surely, 2^111121222321 is an apocalyptic number.

It is an amenable number.

111121222321 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121222321 is an equidigital number, since it uses as much as digits as its factorization.

111121222321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

Adding to 111121222321 its reverse (123222121111), we get a palindrome (234343343432).

The spelling of 111121222321 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty-one".