12221321024 has 56 divisors (see below), whose sum is σ = 27071714208. Its totient is φ = 5425943040.

The previous prime is 12221320987. The next prime is 12221321033. The reversal of 12221321024 is 42012312221.

It is a junction number, because it is equal to n+sod(n) for n = 12221320987 and 12221321005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171587 + ... + 232130.

It is an arithmetic number, because the mean of its divisors is an integer number (483423468).

Almost surely, 2^12221321024 is an apocalyptic number.

It is an amenable number.

12221321024 is an abundant number, since it is smaller than the sum of its proper divisors (14850393184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221321024 is a wasteful number, since it uses less digits than its factorization.

12221321024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403783 (or 403773 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12221321024 its reverse (42012312221), we get a palindrome (54233633245).

The spelling of 12221321024 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-one thousand, twenty-four".