21180993803 has 4 divisors (see below), whose sum is σ = 21196489680. Its totient is φ = 21165497928.

The previous prime is 21180993739. The next prime is 21180993853. The reversal of 21180993803 is 30839908112.

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 21180993803 - 2⁶ = 21180993739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21180993853) 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, 7745888 + ... + 7748621.

It is an arithmetic number, because the mean of its divisors is an integer number (5299122420).

Almost surely, 2^21180993803 is an apocalyptic number.

21180993803 is a deficient number, since it is larger than the sum of its proper divisors (15495877).

21180993803 is a wasteful number, since it uses less digits than its factorization.

21180993803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15495876.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 21180993803 in words is "twenty-one billion, one hundred eighty million, nine hundred ninety-three thousand, eight hundred three".