21204033203 has 4 divisors (see below), whose sum is σ = 21214547880. Its totient is φ = 21193518528.

The previous prime is 21204033199. The next prime is 21204033251. The reversal of 21204033203 is 30233040212.

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 21204033203 - 2² = 21204033199 is a prime.

It is a super-2 number, since 2×21204033203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204030203) 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, 5254313 + ... + 5258346.

It is an arithmetic number, because the mean of its divisors is an integer number (5303636970).

Almost surely, 2^21204033203 is an apocalyptic number.

21204033203 is a deficient number, since it is larger than the sum of its proper divisors (10514677).

21204033203 is a wasteful number, since it uses less digits than its factorization.

21204033203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10514676.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21204033203 its reverse (30233040212), we get a palindrome (51437073415).

The spelling of 21204033203 in words is "twenty-one billion, two hundred four million, thirty-three thousand, two hundred three".