21739330 has 16 divisors (see below), whose sum is σ = 39320064. Its totient is φ = 8653680.

The previous prime is 21739321. The next prime is 21739351. The reversal of 21739330 is 3393712.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3042 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (2457504).

Almost surely, 2^21739330 is an apocalyptic number.

21739330 is a deficient number, since it is larger than the sum of its proper divisors (17580734).

21739330 is a wasteful number, since it uses less digits than its factorization.

21739330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21739330 is about 4662.5454421378. The cubic root of 21739330 is about 279.0928550187.

The spelling of 21739330 in words is "twenty-one million, seven hundred thirty-nine thousand, three hundred thirty".