21030231203 has 4 divisors (see below), whose sum is σ = 21045460848. Its totient is φ = 21015001560.

The previous prime is 21030231197. The next prime is 21030231251. The reversal of 21030231203 is 30213203012.

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 21030231203 - 2⁶ = 21030231139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030231403) 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, 7612751 + ... + 7615512.

It is an arithmetic number, because the mean of its divisors is an integer number (5261365212).

Almost surely, 2^21030231203 is an apocalyptic number.

21030231203 is a deficient number, since it is larger than the sum of its proper divisors (15229645).

21030231203 is a wasteful number, since it uses less digits than its factorization.

21030231203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15229644.

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

Adding to 21030231203 its reverse (30213203012), we get a palindrome (51243434215).

The spelling of 21030231203 in words is "twenty-one billion, thirty million, two hundred thirty-one thousand, two hundred three".