12111222221220 has 24 divisors (see below), whose sum is σ = 33911422219584. Its totient is φ = 3229659258976.

The previous prime is 12111222221201. The next prime is 12111222221257. The reversal of 12111222221220 is 2212222211121.

It is a super-2 number, since 2×12111222221220² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100926851784 + ... + 100926851903.

It is an arithmetic number, because the mean of its divisors is an integer number (1412975925816).

Almost surely, 2^{12111222221220} is an apocalyptic number.

12111222221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111222221220 is an abundant number, since it is smaller than the sum of its proper divisors (21800199998364).

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

12111222221220 is a wasteful number, since it uses less digits than its factorization.

12111222221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201853703699 (or 201853703697 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12111222221220 its reverse (2212222211121), we get a palindrome (14323444432341).

The spelling of 12111222221220 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".