42109111 has 16 divisors (see below), whose sum is σ = 48810240. Its totient is φ = 35925120.

The previous prime is 42109099. The next prime is 42109117. The reversal of 42109111 is 11190124.

It is not a de Polignac number, because 42109111 - 2⁵ = 42109079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42109117) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22726 + ... + 24508.

It is an arithmetic number, because the mean of its divisors is an integer number (3050640).

Almost surely, 2^42109111 is an apocalyptic number.

42109111 is a deficient number, since it is larger than the sum of its proper divisors (6701129).

42109111 is a wasteful number, since it uses less digits than its factorization.

42109111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 42109111 is about 6489.1533346038. The cubic root of 42109111 is about 347.9034143151.

Adding to 42109111 its reverse (11190124), we get a palindrome (53299235).

The spelling of 42109111 in words is "forty-two million, one hundred nine thousand, one hundred eleven".