111421999 has 4 divisors (see below), whose sum is σ = 119992936. Its totient is φ = 102851064.

The previous prime is 111421957. The next prime is 111422009. The reversal of 111421999 is 999124111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111421999 - 2²¹ = 109324847 is a prime.

It is a super-2 number, since 2×111421999² = 24829723722312002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111421399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4285449 + ... + 4285474.

It is an arithmetic number, because the mean of its divisors is an integer number (29998234).

Almost surely, 2^111421999 is an apocalyptic number.

111421999 is a deficient number, since it is larger than the sum of its proper divisors (8570937).

111421999 is an equidigital number, since it uses as much as digits as its factorization.

111421999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570936.

The product of its digits is 5832, while the sum is 37.

The square root of 111421999 is about 10555.6619403996. The cubic root of 111421999 is about 481.1978171563.

The spelling of 111421999 in words is "one hundred eleven million, four hundred twenty-one thousand, nine hundred ninety-nine".