21179463 has 16 divisors (see below), whose sum is σ = 28723200. Its totient is φ = 13880160.

The previous prime is 21179453. The next prime is 21179491. The reversal of 21179463 is 36497112.

It is not a de Polignac number, because 21179463 - 2¹⁶ = 21113927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21179413) 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 15 ways as a sum of consecutive naturals, for example, 78018 + ... + 78288.

It is an arithmetic number, because the mean of its divisors is an integer number (1795200).

Almost surely, 2^21179463 is an apocalyptic number.

21179463 is a deficient number, since it is larger than the sum of its proper divisors (7543737).

21179463 is a wasteful number, since it uses less digits than its factorization.

21179463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

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

The square root of 21179463 is about 4602.1150572318. The cubic root of 21179463 is about 276.6761018379.

The spelling of 21179463 in words is "twenty-one million, one hundred seventy-nine thousand, four hundred sixty-three".