21824636949 has 16 divisors (see below), whose sum is σ = 32341104640. Its totient is φ = 14546018880.

The previous prime is 21824636947. The next prime is 21824636987. The reversal of 21824636949 is 94963642812.

21824636949 is a `hidden beast` number, since 2 + 1 + 82 + 463 + 69 + 49 = 666.

It is not a de Polignac number, because 21824636949 - 2¹ = 21824636947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21824636895 and 21824636904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824636947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5229 + ... + 208989.

It is an arithmetic number, because the mean of its divisors is an integer number (2021319040).

Almost surely, 2^21824636949 is an apocalyptic number.

It is an amenable number.

21824636949 is a deficient number, since it is larger than the sum of its proper divisors (10516467691).

21824636949 is a wasteful number, since it uses less digits than its factorization.

21824636949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207737 (or 207731 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 21824636949 in words is "twenty-one billion, eight hundred twenty-four million, six hundred thirty-six thousand, nine hundred forty-nine".