12120221212 has 48 divisors (see below), whose sum is σ = 23246076672. Its totient is φ = 5483681280.

The previous prime is 12120221189. The next prime is 12120221221. The reversal of 12120221212 is 21212202121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16671193 + ... + 16671919.

It is an arithmetic number, because the mean of its divisors is an integer number (484293264).

Almost surely, 2^12120221212 is an apocalyptic number.

It is an amenable number.

12120221212 is a deficient number, since it is larger than the sum of its proper divisors (11125855460).

12120221212 is a wasteful number, since it uses less digits than its factorization.

12120221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12120221212 its reverse (21212202121), we get a palindrome (33332423333).

It can be divided in two parts, 12120 and 221212, that added together give a palindrome (233332).

The spelling of 12120221212 in words is "twelve billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twelve".