21317433 has 8 divisors (see below), whose sum is σ = 28454496. Its totient is φ = 14196000.

The previous prime is 21317423. The next prime is 21317437. The reversal of 21317433 is 33471312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21317433 - 2¹⁶ = 21251897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21317437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (3556812).

Almost surely, 2^21317433 is an apocalyptic number.

It is an amenable number.

21317433 is a deficient number, since it is larger than the sum of its proper divisors (7137063).

21317433 is a wasteful number, since it uses less digits than its factorization.

21317433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7815.

The product of its digits is 1512, while the sum is 24.

The square root of 21317433 is about 4617.0805710968. The cubic root of 21317433 is about 277.2755883933.

Adding to 21317433 its reverse (33471312), we get a palindrome (54788745).

The spelling of 21317433 in words is "twenty-one million, three hundred seventeen thousand, four hundred thirty-three".