21323312312 has 32 divisors (see below), whose sum is σ = 41781484800. Its totient is φ = 10192134624.

The previous prime is 21323312303. The next prime is 21323312333. The reversal of 21323312312 is 21321332312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643262 + ... + 675597.

It is an arithmetic number, because the mean of its divisors is an integer number (1305671400).

Almost surely, 2^21323312312 is an apocalyptic number.

It is an amenable number.

21323312312 is a deficient number, since it is larger than the sum of its proper divisors (20458172488).

21323312312 is a wasteful number, since it uses less digits than its factorization.

21323312312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318955 (or 1318951 counting only the distinct ones).

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

Adding to 21323312312 its reverse (21321332312), we get a palindrome (42644644624).

The spelling of 21323312312 in words is "twenty-one billion, three hundred twenty-three million, three hundred twelve thousand, three hundred twelve".