21203230333 has 4 divisors (see below), whose sum is σ = 21237484960. Its totient is φ = 21168975708.

The previous prime is 21203230313. The next prime is 21203230361. The reversal of 21203230333 is 33303230212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203230333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203230303) 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, 17126385 + ... + 17127622.

It is an arithmetic number, because the mean of its divisors is an integer number (5309371240).

Almost surely, 2^21203230333 is an apocalyptic number.

It is an amenable number.

21203230333 is a deficient number, since it is larger than the sum of its proper divisors (34254627).

21203230333 is an equidigital number, since it uses as much as digits as its factorization.

21203230333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34254626.

The product of its (nonzero) digits is 1944, while the sum is 22.

Adding to 21203230333 its reverse (33303230212), we get a palindrome (54506460545).

The spelling of 21203230333 in words is "twenty-one billion, two hundred three million, two hundred thirty thousand, three hundred thirty-three".