21507333203 has 4 divisors (see below), whose sum is σ = 21520955640. Its totient is φ = 21493710768.

The previous prime is 21507333173. The next prime is 21507333217. The reversal of 21507333203 is 30233370512.

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 21507333203 - 2⁶ = 21507333139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21507333293) 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, 6808850 + ... + 6812007.

It is an arithmetic number, because the mean of its divisors is an integer number (5380238910).

Almost surely, 2^21507333203 is an apocalyptic number.

21507333203 is a deficient number, since it is larger than the sum of its proper divisors (13622437).

21507333203 is a wasteful number, since it uses less digits than its factorization.

21507333203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13622436.

The product of its (nonzero) digits is 11340, while the sum is 29.

The spelling of 21507333203 in words is "twenty-one billion, five hundred seven million, three hundred thirty-three thousand, two hundred three".