21312132233 has 8 divisors (see below), whose sum is σ = 24534509952. Its totient is φ = 18134201376.

The previous prime is 21312132203. The next prime is 21312132251. The reversal of 21312132233 is 33223121312.

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 21312132233 - 2¹² = 21312128137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312132199 and 21312132208.

It is not an unprimeable number, because it can be changed into a prime (21312132203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11110685 + ... + 11112602.

It is an arithmetic number, because the mean of its divisors is an integer number (3066813744).

Almost surely, 2^21312132233 is an apocalyptic number.

It is an amenable number.

21312132233 is a deficient number, since it is larger than the sum of its proper divisors (3222377719).

21312132233 is a wasteful number, since it uses less digits than its factorization.

21312132233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22223431.

The product of its digits is 1296, while the sum is 23.

Adding to 21312132233 its reverse (33223121312), we get a palindrome (54535253545).

The spelling of 21312132233 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, two hundred thirty-three".