21079724048 has 20 divisors (see below), whose sum is σ = 41300866620. Its totient is φ = 10421435904.

The previous prime is 21079724047. The next prime is 21079724053. The reversal of 21079724048 is 84042797012.

It can be written as a sum of positive squares in 2 ways, for example, as 9388059664 + 11691664384 = 96892^2 + 108128^2 .

It is not an unprimeable number, because it can be changed into a prime (21079724041) 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, 7400165 + ... + 7403012.

It is an arithmetic number, because the mean of its divisors is an integer number (2065043331).

Almost surely, 2^21079724048 is an apocalyptic number.

It is an amenable number.

21079724048 is a deficient number, since it is larger than the sum of its proper divisors (20221142572).

21079724048 is a wasteful number, since it uses less digits than its factorization.

21079724048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14803274 (or 14803268 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 21079724048 in words is "twenty-one billion, seventy-nine million, seven hundred twenty-four thousand, forty-eight".