21248386 has 8 divisors (see below), whose sum is σ = 31892364. Its totient is φ = 10617600.

The previous prime is 21248369. The next prime is 21248401. The reversal of 21248386 is 68384212.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 591361 = 4545^2 + 769^2 .

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, 3706 + ... + 7498.

Almost surely, 2^21248386 is an apocalyptic number.

21248386 is a deficient number, since it is larger than the sum of its proper divisors (10643978).

21248386 is a wasteful number, since it uses less digits than its factorization.

21248386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6596.

The product of its digits is 18432, while the sum is 34.

The square root of 21248386 is about 4609.5971624427. The cubic root of 21248386 is about 276.9759001045.

The spelling of 21248386 in words is "twenty-one million, two hundred forty-eight thousand, three hundred eighty-six".