21231338 has 8 divisors (see below), whose sum is σ = 31879332. Its totient is φ = 10604896.

The previous prime is 21231313. The next prime is 21231359. The reversal of 21231338 is 83313212.

It can be written as a sum of positive squares in 2 ways, for example, as 21224449 + 6889 = 4607^2 + 83^2 .

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, 2645 + ... + 7032.

Almost surely, 2^21231338 is an apocalyptic number.

21231338 is a deficient number, since it is larger than the sum of its proper divisors (10647994).

21231338 is a wasteful number, since it uses less digits than its factorization.

21231338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776.

The product of its digits is 864, while the sum is 23.

The square root of 21231338 is about 4607.7476059350. The cubic root of 21231338 is about 276.9018058725.

The spelling of 21231338 in words is "twenty-one million, two hundred thirty-one thousand, three hundred thirty-eight".