21738746 has 8 divisors (see below), whose sum is σ = 33021120. Its totient is φ = 10731708.

The previous prime is 21738737. The next prime is 21738751. The reversal of 21738746 is 64783712.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68636 + ... + 68951.

It is an arithmetic number, because the mean of its divisors is an integer number (4127640).

Almost surely, 2^21738746 is an apocalyptic number.

21738746 is a deficient number, since it is larger than the sum of its proper divisors (11282374).

21738746 is a wasteful number, since it uses less digits than its factorization.

21738746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137668.

The product of its digits is 56448, while the sum is 38.

The square root of 21738746 is about 4662.4828149817. The cubic root of 21738746 is about 279.0903558358.

The spelling of 21738746 in words is "twenty-one million, seven hundred thirty-eight thousand, seven hundred forty-six".