21179432863 has 4 divisors (see below), whose sum is σ = 21191286600. Its totient is φ = 21167579128.

The previous prime is 21179432851. The next prime is 21179432887. The reversal of 21179432863 is 36823497112.

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 21179432863 - 2⁵ = 21179432831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21179432803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5924188 + ... + 5927761.

It is an arithmetic number, because the mean of its divisors is an integer number (5297821650).

Almost surely, 2^21179432863 is an apocalyptic number.

21179432863 is a deficient number, since it is larger than the sum of its proper divisors (11853737).

21179432863 is a wasteful number, since it uses less digits than its factorization.

21179432863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11853736.

The product of its digits is 435456, while the sum is 46.

The spelling of 21179432863 in words is "twenty-one billion, one hundred seventy-nine million, four hundred thirty-two thousand, eight hundred sixty-three".