12221322012 has 48 divisors (see below), whose sum is σ = 31704909600. Its totient is φ = 4071202560.

The previous prime is 12221321977. The next prime is 12221322017. The reversal of 12221322012 is 21022312221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221322017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140164 + ... + 209972.

It is an arithmetic number, because the mean of its divisors is an integer number (660518950).

Almost surely, 2^12221322012 is an apocalyptic number.

12221322012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221322012 is an abundant number, since it is smaller than the sum of its proper divisors (19483587588).

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

12221322012 is a wasteful number, since it uses less digits than its factorization.

12221322012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71443 (or 71435 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12221322012 its reverse (21022312221), we get a palindrome (33243634233).

The spelling of 12221322012 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-two thousand, twelve".