21245703 has 8 divisors (see below), whose sum is σ = 28551168. Its totient is φ = 14052024.

The previous prime is 21245683. The next prime is 21245713. The reversal of 21245703 is 30754212.

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

It is not a de Polignac number, because 21245703 - 2¹⁴ = 21229319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245713) 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, 27501 + ... + 28262.

It is an arithmetic number, because the mean of its divisors is an integer number (3568896).

Almost surely, 2^21245703 is an apocalyptic number.

21245703 is a deficient number, since it is larger than the sum of its proper divisors (7305465).

21245703 is a wasteful number, since it uses less digits than its factorization.

21245703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55893.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21245703 is about 4609.3061299940. The cubic root of 21245703 is about 276.9642418446.

Adding to 21245703 its reverse (30754212), we get a palindrome (51999915).

The spelling of 21245703 in words is "twenty-one million, two hundred forty-five thousand, seven hundred three".