21608194 has 8 divisors (see below), whose sum is σ = 32432400. Its totient is φ = 10797396.

The previous prime is 21608123. The next prime is 21608227. The reversal of 21608194 is 49180612.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 3397 + ... + 7399.

It is an arithmetic number, because the mean of its divisors is an integer number (4054050).

Almost surely, 2^21608194 is an apocalyptic number.

21608194 is a deficient number, since it is larger than the sum of its proper divisors (10824206).

21608194 is a wasteful number, since it uses less digits than its factorization.

21608194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21608194 is about 4648.4614659046. The cubic root of 21608194 is about 278.5305414710.

The spelling of 21608194 in words is "twenty-one million, six hundred eight thousand, one hundred ninety-four".