21358753268 has 24 divisors (see below), whose sum is σ = 37445415840. Its totient is φ = 10660085280.

The previous prime is 21358753261. The next prime is 21358753279. The reversal of 21358753268 is 86235785312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21358753261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656818 + ... + 7659606.

It is an arithmetic number, because the mean of its divisors is an integer number (1560225660).

Almost surely, 2^21358753268 is an apocalyptic number.

It is an amenable number.

21358753268 is a deficient number, since it is larger than the sum of its proper divisors (16086662572).

21358753268 is a wasteful number, since it uses less digits than its factorization.

21358753268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5567 (or 5565 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The spelling of 21358753268 in words is "twenty-one billion, three hundred fifty-eight million, seven hundred fifty-three thousand, two hundred sixty-eight".