111121201999 has 2 divisors, whose sum is σ = 111121202000. Its totient is φ = 111121201998.

The previous prime is 111121201987. The next prime is 111121202039. The reversal of 111121201999 is 999102121111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111121201999 - 2¹⁵ = 111121169231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111121201969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560600999 + 55560601000.

It is an arithmetic number, because the mean of its divisors is an integer number (55560601000).

Almost surely, 2^111121201999 is an apocalyptic number.

111121201999 is a deficient number, since it is larger than the sum of its proper divisors (1).

111121201999 is an equidigital number, since it uses as much as digits as its factorization.

111121201999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 37.

The spelling of 111121201999 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred one thousand, nine hundred ninety-nine".