21348394 has 4 divisors (see below), whose sum is σ = 32022594. Its totient is φ = 10674196.

The previous prime is 21348391. The next prime is 21348403. The reversal of 21348394 is 49384312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15896169 + 5452225 = 3987^2 + 2335^2 .

It is not an unprimeable number, because it can be changed into a prime (21348391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5337097 + ... + 5337100.

Almost surely, 2^21348394 is an apocalyptic number.

21348394 is a deficient number, since it is larger than the sum of its proper divisors (10674200).

21348394 is a wasteful number, since it uses less digits than its factorization.

21348394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10674199.

The product of its digits is 20736, while the sum is 34.

The square root of 21348394 is about 4620.4322308633. The cubic root of 21348394 is about 277.4097599068.

The spelling of 21348394 in words is "twenty-one million, three hundred forty-eight thousand, three hundred ninety-four".