111330201321821 has 2 divisors, whose sum is σ = 111330201321822. Its totient is φ = 111330201321820.

The previous prime is 111330201321803. The next prime is 111330201321847. The reversal of 111330201321821 is 128123102033111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77355455088025 + 33974746233796 = 8795195^2 + 5828786^2 .

It is a cyclic number.

It is not a de Polignac number, because 111330201321821 - 2¹⁰ = 111330201320797 is a prime.

It is a super-2 number, since 2×111330201321821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111330201321421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55665100660910 + 55665100660911.

It is an arithmetic number, because the mean of its divisors is an integer number (55665100660911).

Almost surely, 2^{111330201321821} is an apocalyptic number.

It is an amenable number.

111330201321821 is a deficient number, since it is larger than the sum of its proper divisors (1).

111330201321821 is an equidigital number, since it uses as much as digits as its factorization.

111330201321821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 111330201321821 its reverse (128123102033111), we get a palindrome (239453303354932).

The spelling of 111330201321821 in words is "one hundred eleven trillion, three hundred thirty billion, two hundred one million, three hundred twenty-one thousand, eight hundred twenty-one".