21179297 has 8 divisors (see below), whose sum is σ = 23400576. Its totient is φ = 19066432.

The previous prime is 21179287. The next prime is 21179299. The reversal of 21179297 is 79297112.

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 21179297 - 2⁶ = 21179233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21179297.

It is not an unprimeable number, because it can be changed into a prime (21179299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26693 + ... + 27474.

It is an arithmetic number, because the mean of its divisors is an integer number (2925072).

Almost surely, 2^21179297 is an apocalyptic number.

It is an amenable number.

21179297 is a deficient number, since it is larger than the sum of its proper divisors (2221279).

21179297 is a wasteful number, since it uses less digits than its factorization.

21179297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54207.

The product of its digits is 15876, while the sum is 38.

The square root of 21179297 is about 4602.0970220107. The cubic root of 21179297 is about 276.6753789937.

The spelling of 21179297 in words is "twenty-one million, one hundred seventy-nine thousand, two hundred ninety-seven".