21394303 has 4 divisors (see below), whose sum is σ = 24450640. Its totient is φ = 18337968.

The previous prime is 21394297. The next prime is 21394327. The reversal of 21394303 is 30349312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21394303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21394363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528158 + ... + 1528171.

It is an arithmetic number, because the mean of its divisors is an integer number (6112660).

Almost surely, 2^21394303 is an apocalyptic number.

21394303 is a deficient number, since it is larger than the sum of its proper divisors (3056337).

21394303 is an equidigital number, since it uses as much as digits as its factorization.

21394303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056336.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 21394303 is about 4625.3976045309. The cubic root of 21394303 is about 277.6084709729.

The spelling of 21394303 in words is "twenty-one million, three hundred ninety-four thousand, three hundred three".