21404194 has 8 divisors (see below), whose sum is σ = 36692928. Its totient is φ = 9173220.

The previous prime is 21404183. The next prime is 21404213. The reversal of 21404194 is 49140412.

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

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, 764422 + ... + 764449.

It is an arithmetic number, because the mean of its divisors is an integer number (4586616).

Almost surely, 2^21404194 is an apocalyptic number.

21404194 is a deficient number, since it is larger than the sum of its proper divisors (15288734).

21404194 is a wasteful number, since it uses less digits than its factorization.

21404194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528880.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21404194 is about 4626.4666863601. The cubic root of 21404194 is about 277.6512456366.

The spelling of 21404194 in words is "twenty-one million, four hundred four thousand, one hundred ninety-four".