21204212333 has 4 divisors (see below), whose sum is σ = 21241348128. Its totient is φ = 21167076540.

The previous prime is 21204212261. The next prime is 21204212347. The reversal of 21204212333 is 33321240212.

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 not a de Polignac number, because 21204212333 - 2⁸ = 21204212077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204212299 and 21204212308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204212033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18567041 + ... + 18568182.

It is an arithmetic number, because the mean of its divisors is an integer number (5310337032).

Almost surely, 2^21204212333 is an apocalyptic number.

It is an amenable number.

21204212333 is a deficient number, since it is larger than the sum of its proper divisors (37135795).

21204212333 is an equidigital number, since it uses as much as digits as its factorization.

21204212333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37135794.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21204212333 its reverse (33321240212), we get a palindrome (54525452545).

The spelling of 21204212333 in words is "twenty-one billion, two hundred four million, two hundred twelve thousand, three hundred thirty-three".