21110194 has 32 divisors (see below), whose sum is σ = 37748736. Its totient is φ = 8663760.

The previous prime is 21110189. The next prime is 21110227. The reversal of 21110194 is 49101112.

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 15 ways as a sum of consecutive naturals, for example, 54927 + ... + 55309.

It is an arithmetic number, because the mean of its divisors is an integer number (1179648).

Almost surely, 2^21110194 is an apocalyptic number.

21110194 is a deficient number, since it is larger than the sum of its proper divisors (16638542).

21110194 is a wasteful number, since it uses less digits than its factorization.

21110194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

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

The square root of 21110194 is about 4594.5831149300. The cubic root of 21110194 is about 276.3741425209.

It can be divided in two parts, 21 and 110194, that added together give a triangular number (110215 = T₄₆₉).

The spelling of 21110194 in words is "twenty-one million, one hundred ten thousand, one hundred ninety-four".