21347179 has 4 divisors (see below), whose sum is σ = 24396784. Its totient is φ = 18297576.

The previous prime is 21347177. The next prime is 21347201. The reversal of 21347179 is 97174312.

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 21347179 - 2¹ = 21347177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21347177) 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, 1524792 + ... + 1524805.

It is an arithmetic number, because the mean of its divisors is an integer number (6099196).

Almost surely, 2^21347179 is an apocalyptic number.

21347179 is a deficient number, since it is larger than the sum of its proper divisors (3049605).

21347179 is an equidigital number, since it uses as much as digits as its factorization.

21347179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3049604.

The product of its digits is 10584, while the sum is 34.

The square root of 21347179 is about 4620.3007477869. The cubic root of 21347179 is about 277.4044970713.

The spelling of 21347179 in words is "twenty-one million, three hundred forty-seven thousand, one hundred seventy-nine".