21339803 has 8 divisors (see below), whose sum is σ = 21950880. Its totient is φ = 20733120.

The previous prime is 21339781. The next prime is 21339809. The reversal of 21339803 is 30893312.

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 21339803 - 2¹⁸ = 21077659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21339809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10418 + ... + 12296.

It is an arithmetic number, because the mean of its divisors is an integer number (2743860).

Almost surely, 2^21339803 is an apocalyptic number.

21339803 is a deficient number, since it is larger than the sum of its proper divisors (611077).

21339803 is a wasteful number, since it uses less digits than its factorization.

21339803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21339803 is about 4619.5024623870. The cubic root of 21339803 is about 277.3725432586.

The spelling of 21339803 in words is "twenty-one million, three hundred thirty-nine thousand, eight hundred three".