12221220111012 has 36 divisors (see below), whose sum is σ = 33700940307216. Its totient is φ = 3703400033520.

The previous prime is 12221220110993. The next prime is 12221220111029. The reversal of 12221220111012 is 21011102212221.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15430833078 + ... + 15430833869.

It is an arithmetic number, because the mean of its divisors is an integer number (936137230756).

Almost surely, 2^{12221220111012} is an apocalyptic number.

12221220111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221220111012 is an abundant number, since it is smaller than the sum of its proper divisors (21479720196204).

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

12221220111012 is a wasteful number, since it uses less digits than its factorization.

12221220111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30861666968 (or 30861666963 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12221220111012 its reverse (21011102212221), we get a palindrome (33232322323233).

The spelling of 12221220111012 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, twelve".