2111809042 has 16 divisors (see below), whose sum is σ = 3624863040. Its totient is φ = 903906288.

The previous prime is 2111809033. The next prime is 2111809057. The reversal of 2111809042 is 2409081112.

It is a self number, because there is not a number n which added to its sum of digits gives 2111809042.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84817 + ... + 106852.

It is an arithmetic number, because the mean of its divisors is an integer number (226553940).

Almost surely, 2^2111809042 is an apocalyptic number.

2111809042 is a deficient number, since it is larger than the sum of its proper divisors (1513053998).

2111809042 is a wasteful number, since it uses less digits than its factorization.

2111809042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192465.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 2111809042 is about 45954.4235302762. The cubic root of 2111809042 is about 1282.9750626295.

The spelling of 2111809042 in words is "two billion, one hundred eleven million, eight hundred nine thousand, forty-two".