21179433547 has 8 divisors (see below), whose sum is σ = 21287804912. Its totient is φ = 21071232000.

The previous prime is 21179433529. The next prime is 21179433557. The reversal of 21179433547 is 74533497112.

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 21179433547 - 2¹⁵ = 21179400779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21179433497 and 21179433506.

It is not an unprimeable number, because it can be changed into a prime (21179433557) 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, 211483 + ... + 295099.

It is an arithmetic number, because the mean of its divisors is an integer number (2660975614).

Almost surely, 2^21179433547 is an apocalyptic number.

21179433547 is a deficient number, since it is larger than the sum of its proper divisors (108371365).

21179433547 is a wasteful number, since it uses less digits than its factorization.

21179433547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84909.

The product of its digits is 635040, while the sum is 46.

The spelling of 21179433547 in words is "twenty-one billion, one hundred seventy-nine million, four hundred thirty-three thousand, five hundred forty-seven".