21320231203 has 4 divisors (see below), whose sum is σ = 21321068368. Its totient is φ = 21319394040.

The previous prime is 21320231171. The next prime is 21320231213. The reversal of 21320231203 is 30213202312.

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 21320231203 - 2⁵ = 21320231171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320231213) 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, 379143 + ... + 431728.

It is an arithmetic number, because the mean of its divisors is an integer number (5330267092).

Almost surely, 2^21320231203 is an apocalyptic number.

21320231203 is a deficient number, since it is larger than the sum of its proper divisors (837165).

21320231203 is an equidigital number, since it uses as much as digits as its factorization.

21320231203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837164.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320231203 its reverse (30213202312), we get a palindrome (51533433515).

The spelling of 21320231203 in words is "twenty-one billion, three hundred twenty million, two hundred thirty-one thousand, two hundred three".