21479524393 has 4 divisors (see below), whose sum is σ = 21569397120. Its totient is φ = 21389651668.

The previous prime is 21479524387. The next prime is 21479524403. The reversal of 21479524393 is 39342597412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21479524393 is a prime.

It is a super-2 number, since 2×21479524393² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21479527393) 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 3 ways as a sum of consecutive naturals, for example, 44936005 + ... + 44936482.

It is an arithmetic number, because the mean of its divisors is an integer number (5392349280).

Almost surely, 2^21479524393 is an apocalyptic number.

It is an amenable number.

21479524393 is a deficient number, since it is larger than the sum of its proper divisors (89872727).

21479524393 is an equidigital number, since it uses as much as digits as its factorization.

21479524393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89872726.

The product of its digits is 1632960, while the sum is 49.

The spelling of 21479524393 in words is "twenty-one billion, four hundred seventy-nine million, five hundred twenty-four thousand, three hundred ninety-three".