12221000312 has 8 divisors (see below), whose sum is σ = 22914375600. Its totient is φ = 6110500152.

The previous prime is 12221000293. The next prime is 12221000329. The reversal of 12221000312 is 21300012221.

It is a happy number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 763812512 + ... + 763812527.

It is an arithmetic number, because the mean of its divisors is an integer number (2864296950).

Almost surely, 2^12221000312 is an apocalyptic number.

It is an amenable number.

12221000312 is a deficient number, since it is larger than the sum of its proper divisors (10693375288).

12221000312 is a wasteful number, since it uses less digits than its factorization.

12221000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527625045 (or 1527625041 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12221000312 its reverse (21300012221), we get a palindrome (33521012533).

The spelling of 12221000312 in words is "twelve billion, two hundred twenty-one million, three hundred twelve", and thus it is an aban number.