21303572203 has 4 divisors (see below), whose sum is σ = 21371635048. Its totient is φ = 21235509360.

The previous prime is 21303572183. The next prime is 21303572249. The reversal of 21303572203 is 30227530312.

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 21303572203 - 2⁹ = 21303571691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303572263) 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, 34030953 + ... + 34031578.

It is an arithmetic number, because the mean of its divisors is an integer number (5342908762).

Almost surely, 2^21303572203 is an apocalyptic number.

21303572203 is a deficient number, since it is larger than the sum of its proper divisors (68062845).

21303572203 is an equidigital number, since it uses as much as digits as its factorization.

21303572203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68062844.

The product of its (nonzero) digits is 7560, while the sum is 28.

The spelling of 21303572203 in words is "twenty-one billion, three hundred three million, five hundred seventy-two thousand, two hundred three".