21312400233 has 8 divisors (see below), whose sum is σ = 28463976000. Its totient is φ = 14184545648.

The previous prime is 21312400189. The next prime is 21312400247. The reversal of 21312400233 is 33200421312.

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 21312400233 - 2⁹ = 21312399721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21312400253) 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, 5928198 + ... + 5931791.

It is an arithmetic number, because the mean of its divisors is an integer number (3557997000).

Almost surely, 2^21312400233 is an apocalyptic number.

It is an amenable number.

21312400233 is a deficient number, since it is larger than the sum of its proper divisors (7151575767).

21312400233 is a wasteful number, since it uses less digits than its factorization.

21312400233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11860591.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21312400233 its reverse (33200421312), we get a palindrome (54512821545).

The spelling of 21312400233 in words is "twenty-one billion, three hundred twelve million, four hundred thousand, two hundred thirty-three".