21259932803 has 4 divisors (see below), whose sum is σ = 21272687880. Its totient is φ = 21247177728.

The previous prime is 21259932791. The next prime is 21259932821. The reversal of 21259932803 is 30823995212.

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

It is a cyclic number.

It is not a de Polignac number, because 21259932803 - 2⁶ = 21259932739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21259932833) 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, 6375038 + ... + 6378371.

It is an arithmetic number, because the mean of its divisors is an integer number (5318171970).

Almost surely, 2^21259932803 is an apocalyptic number.

21259932803 is a deficient number, since it is larger than the sum of its proper divisors (12755077).

21259932803 is a wasteful number, since it uses less digits than its factorization.

21259932803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12755076.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 21259932803 in words is "twenty-one billion, two hundred fifty-nine million, nine hundred thirty-two thousand, eight hundred three".