21199774 has 8 divisors (see below), whose sum is σ = 32539320. Its totient is φ = 10353336.

The previous prime is 21199751. The next prime is 21199781. The reversal of 21199774 is 47799112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123169 + ... + 123340.

It is an arithmetic number, because the mean of its divisors is an integer number (4067415).

Almost surely, 2^21199774 is an apocalyptic number.

21199774 is a deficient number, since it is larger than the sum of its proper divisors (11339546).

21199774 is a wasteful number, since it uses less digits than its factorization.

21199774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246554.

The product of its digits is 31752, while the sum is 40.

The square root of 21199774 is about 4604.3212311914. The cubic root of 21199774 is about 276.7645172505.

The spelling of 21199774 in words is "twenty-one million, one hundred ninety-nine thousand, seven hundred seventy-four".