21320093 has 8 divisors (see below), whose sum is σ = 22083840. Its totient is φ = 20569360.

The previous prime is 21320083. The next prime is 21320099. The reversal of 21320093 is 39002312.

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 21320093 - 2¹² = 21315997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320099) 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, 143 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (2760480).

Almost surely, 2^21320093 is an apocalyptic number.

It is an amenable number.

21320093 is a deficient number, since it is larger than the sum of its proper divisors (763747).

21320093 is an equidigital number, since it uses as much as digits as its factorization.

21320093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6507.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 21320093 is about 4617.3686229280. The cubic root of 21320093 is about 277.2871207760.

The spelling of 21320093 in words is "twenty-one million, three hundred twenty thousand, ninety-three".