21713093 has 8 divisors (see below), whose sum is σ = 22231800. Its totient is φ = 21198528.

The previous prime is 21713059. The next prime is 21713099. The reversal of 21713093 is 39031712.

It can be written as a sum of positive squares in 4 ways, for example, as 16176484 + 5536609 = 4022^2 + 2353^2 .

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 21713093 - 2¹⁶ = 21647557 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 (21713099) 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, 11243 + ... + 13031.

It is an arithmetic number, because the mean of its divisors is an integer number (2778975).

Almost surely, 2^21713093 is an apocalyptic number.

It is an amenable number.

21713093 is a deficient number, since it is larger than the sum of its proper divisors (518707).

21713093 is a wasteful number, since it uses less digits than its factorization.

21713093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21713093 is about 4659.7310008197. The cubic root of 21713093 is about 278.9805316083.

The spelling of 21713093 in words is "twenty-one million, seven hundred thirteen thousand, ninety-three".