12100221312 has 32 divisors (see below), whose sum is σ = 32141213880. Its totient is φ = 4033406976.

The previous prime is 12100221281. The next prime is 12100221337. The reversal of 12100221312 is 21312200121.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 12100221291 and 12100221300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15755113 + ... + 15755880.

Almost surely, 2^12100221312 is an apocalyptic number.

12100221312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12100221312 is an abundant number, since it is smaller than the sum of its proper divisors (20040992568).

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

12100221312 is an equidigital number, since it uses as much as digits as its factorization.

12100221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31511010 (or 31510998 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12100221312 its reverse (21312200121), we get a palindrome (33412421433).

The spelling of 12100221312 in words is "twelve billion, one hundred million, two hundred twenty-one thousand, three hundred twelve".