21338179 has 4 divisors (see below), whose sum is σ = 22593384. Its totient is φ = 20082976.

The previous prime is 21338153. The next prime is 21338183. The reversal of 21338179 is 97183312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21338179 - 2¹¹ = 21336131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21338189) 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, 627577 + ... + 627610.

It is an arithmetic number, because the mean of its divisors is an integer number (5648346).

Almost surely, 2^21338179 is an apocalyptic number.

21338179 is a deficient number, since it is larger than the sum of its proper divisors (1255205).

21338179 is a wasteful number, since it uses less digits than its factorization.

21338179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255204.

The product of its digits is 9072, while the sum is 34.

The square root of 21338179 is about 4619.3266825372. The cubic root of 21338179 is about 277.3655068857.

The spelling of 21338179 in words is "twenty-one million, three hundred thirty-eight thousand, one hundred seventy-nine".