21333433306 has 4 divisors (see below), whose sum is σ = 32000149962. Its totient is φ = 10666716652.

The previous prime is 21333433283. The next prime is 21333433307. The reversal of 21333433306 is 60333433312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19693912225 + 1639521081 = 140335^2 + 40491^2 .

It is not an unprimeable number, because it can be changed into a prime (21333433307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333358325 + ... + 5333358328.

Almost surely, 2^21333433306 is an apocalyptic number.

21333433306 is a deficient number, since it is larger than the sum of its proper divisors (10666716656).

21333433306 is a wasteful number, since it uses less digits than its factorization.

21333433306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666716655.

The product of its (nonzero) digits is 34992, while the sum is 31.

Adding to 21333433306 its reverse (60333433312), we get a palindrome (81666866618).

The spelling of 21333433306 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-three thousand, three hundred six".