21234232312 has 8 divisors (see below), whose sum is σ = 39814185600. Its totient is φ = 10617116152.

The previous prime is 21234232307. The next prime is 21234232343. The reversal of 21234232312 is 21323243212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1327139512 + ... + 1327139527.

It is an arithmetic number, because the mean of its divisors is an integer number (4976773200).

Almost surely, 2^21234232312 is an apocalyptic number.

It is an amenable number.

21234232312 is a deficient number, since it is larger than the sum of its proper divisors (18579953288).

21234232312 is a wasteful number, since it uses less digits than its factorization.

21234232312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654279045 (or 2654279041 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

Adding to 21234232312 its reverse (21323243212), we get a palindrome (42557475524).

The spelling of 21234232312 in words is "twenty-one billion, two hundred thirty-four million, two hundred thirty-two thousand, three hundred twelve".