21334738 has 4 divisors (see below), whose sum is σ = 32002110. Its totient is φ = 10667368.

The previous prime is 21334723. The next prime is 21334759. The reversal of 21334738 is 83743312.

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

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 1505529 = 4453^2 + 1227^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5333683 + ... + 5333686.

Almost surely, 2^21334738 is an apocalyptic number.

21334738 is a deficient number, since it is larger than the sum of its proper divisors (10667372).

21334738 is a wasteful number, since it uses less digits than its factorization.

21334738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10667371.

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

The square root of 21334738 is about 4618.9542106412. The cubic root of 21334738 is about 277.3505967408.

The spelling of 21334738 in words is "twenty-one million, three hundred thirty-four thousand, seven hundred thirty-eight".