111321205819 has 2 divisors, whose sum is σ = 111321205820. Its totient is φ = 111321205818.

The previous prime is 111321205817. The next prime is 111321205823. The reversal of 111321205819 is 918502123111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111321205819 - 2¹ = 111321205817 is a prime.

It is a super-2 number, since 2×111321205819² (a number of 23 digits) contains 22 as substring.

Together with 111321205817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111321205817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55660602909 + 55660602910.

It is an arithmetic number, because the mean of its divisors is an integer number (55660602910).

Almost surely, 2^111321205819 is an apocalyptic number.

111321205819 is a deficient number, since it is larger than the sum of its proper divisors (1).

111321205819 is an equidigital number, since it uses as much as digits as its factorization.

111321205819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 34.

The spelling of 111321205819 in words is "one hundred eleven billion, three hundred twenty-one million, two hundred five thousand, eight hundred nineteen".