21147794 has 8 divisors (see below), whose sum is σ = 32579148. Its totient is φ = 10288080.

The previous prime is 21147781. The next prime is 21147803. The reversal of 21147794 is 49774112.

It can be written as a sum of positive squares in 2 ways, for example, as 14922769 + 6225025 = 3863^2 + 2495^2 .

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, 142817 + ... + 142964.

Almost surely, 2^21147794 is an apocalyptic number.

21147794 is a deficient number, since it is larger than the sum of its proper divisors (11431354).

21147794 is a wasteful number, since it uses less digits than its factorization.

21147794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285820.

The product of its digits is 14112, while the sum is 35.

The square root of 21147794 is about 4598.6730694843. The cubic root of 21147794 is about 276.5381312905.

The spelling of 21147794 in words is "twenty-one million, one hundred forty-seven thousand, seven hundred ninety-four".