12212121111012 has 18 divisors (see below), whose sum is σ = 30869528364038. Its totient is φ = 4070707036992.

The previous prime is 12212121110977. The next prime is 12212121111013. The reversal of 12212121111012 is 21011112121221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11942940692736 + 269180418276 = 3455856^2 + 518826^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (12212121111013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169612793173 + ... + 169612793244.

Almost surely, 2^{12212121111012} is an apocalyptic number.

12212121111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12212121111012 is an abundant number, since it is smaller than the sum of its proper divisors (18657407253026).

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

12212121111012 is a wasteful number, since it uses less digits than its factorization.

12212121111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339225586427 (or 339225586422 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12212121111012 its reverse (21011112121221), we get a palindrome (33223233232233).

The spelling of 12212121111012 in words is "twelve trillion, two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, twelve".