21183572803 has 4 divisors (see below), whose sum is σ = 21338197560. Its totient is φ = 21028948048.

The previous prime is 21183572779. The next prime is 21183572819. The reversal of 21183572803 is 30827538112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21183572803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21183572863) 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 3 ways as a sum of consecutive naturals, for example, 77312173 + ... + 77312446.

It is an arithmetic number, because the mean of its divisors is an integer number (5334549390).

Almost surely, 2^21183572803 is an apocalyptic number.

21183572803 is a deficient number, since it is larger than the sum of its proper divisors (154624757).

21183572803 is a wasteful number, since it uses less digits than its factorization.

21183572803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154624756.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21183572803 in words is "twenty-one billion, one hundred eighty-three million, five hundred seventy-two thousand, eight hundred three".