21323703 has 8 divisors (see below), whose sum is σ = 28473328. Its totient is φ = 14194944.

The previous prime is 21323693. The next prime is 21323707. The reversal of 21323703 is 30732312.

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

It is not a de Polignac number, because 21323703 - 2⁹ = 21323191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323707) 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, 2650 + ... + 7047.

It is an arithmetic number, because the mean of its divisors is an integer number (3559166).

Almost surely, 2^21323703 is an apocalyptic number.

21323703 is a deficient number, since it is larger than the sum of its proper divisors (7149625).

21323703 is an equidigital number, since it uses as much as digits as its factorization.

21323703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10433.

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21323703 is about 4617.7595216728. The cubic root of 21323703 is about 277.3027703327.

The spelling of 21323703 in words is "twenty-one million, three hundred twenty-three thousand, seven hundred three".