21031302203 has 4 divisors (see below), whose sum is σ = 21062368320. Its totient is φ = 21000236088.

The previous prime is 21031302181. The next prime is 21031302209. The reversal of 21031302203 is 30220313012.

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 21031302203 - 2¹⁸ = 21031040059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031302209) 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, 15532043 + ... + 15533396.

It is an arithmetic number, because the mean of its divisors is an integer number (5265592080).

Almost surely, 2^21031302203 is an apocalyptic number.

21031302203 is a deficient number, since it is larger than the sum of its proper divisors (31066117).

21031302203 is an equidigital number, since it uses as much as digits as its factorization.

21031302203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31066116.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21031302203 its reverse (30220313012), we get a palindrome (51251615215).

The spelling of 21031302203 in words is "twenty-one billion, thirty-one million, three hundred two thousand, two hundred three".