21338734 has 8 divisors (see below), whose sum is σ = 32059080. Its totient is φ = 10652376.

The previous prime is 21338731. The next prime is 21338741. The reversal of 21338734 is 43783312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21338696 and 21338705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338731) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 6864 + ... + 9475.

It is an arithmetic number, because the mean of its divisors is an integer number (4007385).

Almost surely, 2^21338734 is an apocalyptic number.

21338734 is a deficient number, since it is larger than the sum of its proper divisors (10720346).

21338734 is a wasteful number, since it uses less digits than its factorization.

21338734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16994.

The product of its digits is 12096, while the sum is 31.

The square root of 21338734 is about 4619.3867558368. The cubic root of 21338734 is about 277.3679115976.

The spelling of 21338734 in words is "twenty-one million, three hundred thirty-eight thousand, seven hundred thirty-four".