21321312333 has 4 divisors (see below), whose sum is σ = 28428416448. Its totient is φ = 14214208220.

The previous prime is 21321312281. The next prime is 21321312349. The reversal of 21321312333 is 33321312312.

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 21321312333 - 2¹² = 21321308237 is a prime.

It is a super-3 number, since 3×21321312333³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321312833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553552053 + ... + 3553552058.

It is an arithmetic number, because the mean of its divisors is an integer number (7107104112).

Almost surely, 2^21321312333 is an apocalyptic number.

It is an amenable number.

21321312333 is a deficient number, since it is larger than the sum of its proper divisors (7107104115).

21321312333 is an equidigital number, since it uses as much as digits as its factorization.

21321312333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107104114.

The product of its digits is 1944, while the sum is 24.

Adding to 21321312333 its reverse (33321312312), we get a palindrome (54642624645).

The spelling of 21321312333 in words is "twenty-one billion, three hundred twenty-one million, three hundred twelve thousand, three hundred thirty-three".