21713933 has 4 divisors (see below), whose sum is σ = 21723360. Its totient is φ = 21704508.

The previous prime is 21713929. The next prime is 21713957. The reversal of 21713933 is 33931712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21713933 - 2² = 21713929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21713896 and 21713905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713983) 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 3 ways as a sum of consecutive naturals, for example, 1298 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (5430840).

Almost surely, 2^21713933 is an apocalyptic number.

It is an amenable number.

21713933 is a deficient number, since it is larger than the sum of its proper divisors (9427).

21713933 is an equidigital number, since it uses as much as digits as its factorization.

21713933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426.

The product of its digits is 3402, while the sum is 29.

The square root of 21713933 is about 4659.8211339063. The cubic root of 21713933 is about 278.9841291401.

The spelling of 21713933 in words is "twenty-one million, seven hundred thirteen thousand, nine hundred thirty-three".