21312032333 has 4 divisors (see below), whose sum is σ = 21673253280. Its totient is φ = 20950811388.

The previous prime is 21312032327. The next prime is 21312032351. The reversal of 21312032333 is 33323021312.

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 21312032333 - 2⁴ = 21312032317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21312032299 and 21312032308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312032033) 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, 180610385 + ... + 180610502.

It is an arithmetic number, because the mean of its divisors is an integer number (5418313320).

Almost surely, 2^21312032333 is an apocalyptic number.

It is an amenable number.

21312032333 is a deficient number, since it is larger than the sum of its proper divisors (361220947).

21312032333 is an equidigital number, since it uses as much as digits as its factorization.

21312032333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361220946.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21312032333 its reverse (33323021312), we get a palindrome (54635053645).

The spelling of 21312032333 in words is "twenty-one billion, three hundred twelve million, thirty-two thousand, three hundred thirty-three".