21043194 has 8 divisors (see below), whose sum is σ = 42086400. Its totient is φ = 7014396.

The previous prime is 21043177. The next prime is 21043207. The reversal of 21043194 is 49134012.

It is a sphenic number, since it is the product of 3 distinct primes.

21043194 is an admirable number.

It is an unprimeable number.

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, 1753594 + ... + 1753605.

It is an arithmetic number, because the mean of its divisors is an integer number (5260800).

Almost surely, 2^21043194 is an apocalyptic number.

21043194 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21043194 is a wasteful number, since it uses less digits than its factorization.

21043194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507204.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21043194 is about 4587.2861258047. The cubic root of 21043194 is about 276.0814451930.

The spelling of 21043194 in words is "twenty-one million, forty-three thousand, one hundred ninety-four".