21163479 has 4 divisors (see below), whose sum is σ = 28217976. Its totient is φ = 14108984.

The previous prime is 21163469. The next prime is 21163481. The reversal of 21163479 is 97436112.

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 21163479 - 2⁴ = 21163463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163459) 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, 3527244 + ... + 3527249.

It is an arithmetic number, because the mean of its divisors is an integer number (7054494).

Almost surely, 2^21163479 is an apocalyptic number.

21163479 is a deficient number, since it is larger than the sum of its proper divisors (7054497).

21163479 is an equidigital number, since it uses as much as digits as its factorization.

21163479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7054496.

The product of its digits is 9072, while the sum is 33.

The square root of 21163479 is about 4600.3781366318. The cubic root of 21163479 is about 276.6064824493.

The spelling of 21163479 in words is "twenty-one million, one hundred sixty-three thousand, four hundred seventy-nine".