111421665 has 12 divisors (see below), whose sum is σ = 193130964. Its totient is φ = 59424864.

The previous prime is 111421619. The next prime is 111421691. The reversal of 111421665 is 566124111.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 90326016 = 4593^2 + 9504^2 .

It is not a de Polignac number, because 111421665 - 2⁶ = 111421601 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1237974 + ... + 1238063.

It is an arithmetic number, because the mean of its divisors is an integer number (16094247).

Almost surely, 2^111421665 is an apocalyptic number.

111421665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111421665 is a deficient number, since it is larger than the sum of its proper divisors (81709299).

111421665 is a wasteful number, since it uses less digits than its factorization.

111421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476048 (or 2476045 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 111421665 is about 10555.6461194945. The cubic root of 111421665 is about 481.1973363410.

Adding to 111421665 its reverse (566124111), we get a palindrome (677545776).

The spelling of 111421665 in words is "one hundred eleven million, four hundred twenty-one thousand, six hundred sixty-five".