12321221012 has 12 divisors (see below), whose sum is σ = 21574590996. Its totient is φ = 6157052160.

The previous prime is 12321220997. The next prime is 12321221069. The reversal of 12321221012 is 21012212321.

It can be written as a sum of positive squares in 2 ways, for example, as 8887964176 + 3433256836 = 94276^2 + 58594^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 881789 + ... + 895652.

It is an arithmetic number, because the mean of its divisors is an integer number (1797882583).

Almost surely, 2^12321221012 is an apocalyptic number.

It is an amenable number.

12321221012 is a deficient number, since it is larger than the sum of its proper divisors (9253369984).

12321221012 is a wasteful number, since it uses less digits than its factorization.

12321221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779178 (or 1779176 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12321221012 its reverse (21012212321), we get a palindrome (33333433333).

The spelling of 12321221012 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, twelve".