21320193 has 8 divisors (see below), whose sum is σ = 30099168. Its totient is φ = 13377344.

The previous prime is 21320183. The next prime is 21320197. The reversal of 21320193 is 39102312.

It is a happy number.

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 21320193 - 2⁸ = 21319937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21320197) 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, 208971 + ... + 209072.

It is an arithmetic number, because the mean of its divisors is an integer number (3762396).

Almost surely, 2^21320193 is an apocalyptic number.

It is an amenable number.

21320193 is a deficient number, since it is larger than the sum of its proper divisors (8778975).

21320193 is a wasteful number, since it uses less digits than its factorization.

21320193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418063.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21320193 is about 4617.3794515937. The cubic root of 21320193 is about 277.2875543055.

The spelling of 21320193 in words is "twenty-one million, three hundred twenty thousand, one hundred ninety-three".