21481179 has 8 divisors (see below), whose sum is σ = 28698432. Its totient is φ = 14292360.

The previous prime is 21481177. The next prime is 21481193. The reversal of 21481179 is 97118412.

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

It is not a de Polignac number, because 21481179 - 2¹ = 21481177 is a prime.

It is a super-2 number, since 2×21481179² = 922882102460082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21481177) 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, 5277 + ... + 8414.

It is an arithmetic number, because the mean of its divisors is an integer number (3587304).

Almost surely, 2^21481179 is an apocalyptic number.

21481179 is a deficient number, since it is larger than the sum of its proper divisors (7217253).

21481179 is a wasteful number, since it uses less digits than its factorization.

21481179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14217.

The product of its digits is 4032, while the sum is 33.

The square root of 21481179 is about 4634.7792827706. The cubic root of 21481179 is about 277.9837257350.

The spelling of 21481179 in words is "twenty-one million, four hundred eighty-one thousand, one hundred seventy-nine".