21713433 has 16 divisors (see below), whose sum is σ = 33555456. Its totient is φ = 12232080.

The previous prime is 21713407. The next prime is 21713443. The reversal of 21713433 is 33431712.

It is not a de Polignac number, because 21713433 - 2⁸ = 21713177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21713443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5791 + ... + 8772.

It is an arithmetic number, because the mean of its divisors is an integer number (2097216).

Almost surely, 2^21713433 is an apocalyptic number.

It is an amenable number.

21713433 is a deficient number, since it is larger than the sum of its proper divisors (11842023).

21713433 is a wasteful number, since it uses less digits than its factorization.

21713433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14644.

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

The square root of 21713433 is about 4659.7674834695. The cubic root of 21713433 is about 278.9819877633.

The spelling of 21713433 in words is "twenty-one million, seven hundred thirteen thousand, four hundred thirty-three".