21303793 has 8 divisors (see below), whose sum is σ = 24437312. Its totient is φ = 18192816.

The previous prime is 21303787. The next prime is 21303797. The reversal of 21303793 is 39730312.

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

It is a cyclic number.

It is not a de Polignac number, because 21303793 - 2¹³ = 21295601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303797) 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 7 ways as a sum of consecutive naturals, for example, 3555 + ... + 7432.

It is an arithmetic number, because the mean of its divisors is an integer number (3054664).

Almost surely, 2^21303793 is an apocalyptic number.

It is an amenable number.

21303793 is a deficient number, since it is larger than the sum of its proper divisors (3133519).

21303793 is a wasteful number, since it uses less digits than its factorization.

21303793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11271.

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

The square root of 21303793 is about 4615.6032108490. The cubic root of 21303793 is about 277.2164373382.

The spelling of 21303793 in words is "twenty-one million, three hundred three thousand, seven hundred ninety-three".