21337394 has 16 divisors (see below), whose sum is σ = 34859160. Its totient is φ = 9736320.

The previous prime is 21337369. The next prime is 21337439. The reversal of 21337394 is 49373312.

It can be written as a sum of positive squares in 4 ways, for example, as 16297369 + 5040025 = 4037^2 + 2245^2 .

It is a super-2 number, since 2×21337394² = 910568765422472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21337394.

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 7 ways as a sum of consecutive naturals, for example, 2297 + ... + 6924.

Almost surely, 2^21337394 is an apocalyptic number.

21337394 is a deficient number, since it is larger than the sum of its proper divisors (13521766).

21337394 is a wasteful number, since it uses less digits than its factorization.

21337394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325.

The product of its digits is 13608, while the sum is 32.

The square root of 21337394 is about 4619.2417126624. The cubic root of 21337394 is about 277.3621055552.

The spelling of 21337394 in words is "twenty-one million, three hundred thirty-seven thousand, three hundred ninety-four".