21338601 has 8 divisors (see below), whose sum is σ = 28532160. Its totient is φ = 14185392.

The previous prime is 21338599. The next prime is 21338609. The reversal of 21338601 is 10683312.

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

It is not a de Polignac number, because 21338601 - 2¹ = 21338599 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21338609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8830 + ... + 10983.

It is an arithmetic number, because the mean of its divisors is an integer number (3566520).

Almost surely, 2^21338601 is an apocalyptic number.

It is an amenable number.

21338601 is a deficient number, since it is larger than the sum of its proper divisors (7193559).

21338601 is a wasteful number, since it uses less digits than its factorization.

21338601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20175.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21338601 is about 4619.3723599641. The cubic root of 21338601 is about 277.3673353371.

The spelling of 21338601 in words is "twenty-one million, three hundred thirty-eight thousand, six hundred one".