21433246 has 4 divisors (see below), whose sum is σ = 32149872. Its totient is φ = 10716622.

The previous prime is 21433231. The next prime is 21433259. The reversal of 21433246 is 64233412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21433246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358310 + ... + 5358313.

It is an arithmetic number, because the mean of its divisors is an integer number (8037468).

Almost surely, 2^21433246 is an apocalyptic number.

21433246 is a deficient number, since it is larger than the sum of its proper divisors (10716626).

21433246 is a wasteful number, since it uses less digits than its factorization.

21433246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716625.

The product of its digits is 3456, while the sum is 25.

The square root of 21433246 is about 4629.6053827513. The cubic root of 21433246 is about 277.7768079018.

Adding to 21433246 its reverse (64233412), we get a palindrome (85666658).

The spelling of 21433246 in words is "twenty-one million, four hundred thirty-three thousand, two hundred forty-six".