21033023203 has 12 divisors (see below), whose sum is σ = 22354327800. Its totient is φ = 19785784832.

The previous prime is 21033023183. The next prime is 21033023239. The reversal of 21033023203 is 30232033012.

It is a happy number.

It is not a de Polignac number, because 21033023203 - 2¹³ = 21033015011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033023243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 589275 + ... + 623947.

It is an arithmetic number, because the mean of its divisors is an integer number (1862860650).

Almost surely, 2^21033023203 is an apocalyptic number.

21033023203 is a deficient number, since it is larger than the sum of its proper divisors (1321304597).

21033023203 is a wasteful number, since it uses less digits than its factorization.

21033023203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36806 (or 36789 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21033023203 its reverse (30232033012), we get a palindrome (51265056215).

The spelling of 21033023203 in words is "twenty-one billion, thirty-three million, twenty-three thousand, two hundred three".