21360093 has 4 divisors (see below), whose sum is σ = 28480128. Its totient is φ = 14240060.

The previous prime is 21360083. The next prime is 21360107. The reversal of 21360093 is 39006312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21360093 - 2¹⁰ = 21359069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360013) 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, 3560013 + ... + 3560018.

It is an arithmetic number, because the mean of its divisors is an integer number (7120032).

Almost surely, 2^21360093 is an apocalyptic number.

It is an amenable number.

21360093 is a deficient number, since it is larger than the sum of its proper divisors (7120035).

21360093 is an equidigital number, since it uses as much as digits as its factorization.

21360093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120034.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 21360093 is about 4621.6980645646. The cubic root of 21360093 is about 277.4604245161.

It can be divided in two parts, 213 and 60093, that added together give a palindrome (60306).

The spelling of 21360093 in words is "twenty-one million, three hundred sixty thousand, ninety-three".