21312033233 has 8 divisors (see below), whose sum is σ = 22044339456. Its totient is φ = 20582528400.

The previous prime is 21312033209. The next prime is 21312033241. The reversal of 21312033233 is 33233021312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21312033233 - 2⁸ = 21312032977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312033199 and 21312033208.

It is not an unprimeable number, because it can be changed into a prime (21312033133) 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 7 ways as a sum of consecutive naturals, for example, 684866 + ... + 715307.

It is an arithmetic number, because the mean of its divisors is an integer number (2755542432).

Almost surely, 2^21312033233 is an apocalyptic number.

It is an amenable number.

21312033233 is a deficient number, since it is larger than the sum of its proper divisors (732306223).

21312033233 is a wasteful number, since it uses less digits than its factorization.

21312033233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400695.

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

Adding to 21312033233 its reverse (33233021312), we get a palindrome (54545054545).

The spelling of 21312033233 in words is "twenty-one billion, three hundred twelve million, thirty-three thousand, two hundred thirty-three".