12111212221002 has 24 divisors (see below), whose sum is σ = 27622062960960. Its totient is φ = 3824593332840.

The previous prime is 12111212221001. The next prime is 12111212221037. The reversal of 12111212221002 is 20012221211121.

It is a super-2 number, since 2×12111212221002² (a number of 27 digits) contains 22 as substring.

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 (12111212221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17706450274 + ... + 17706450957.

It is an arithmetic number, because the mean of its divisors is an integer number (1150919290040).

Almost surely, 2^{12111212221002} is an apocalyptic number.

12111212221002 is an abundant number, since it is smaller than the sum of its proper divisors (15510850739958).

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

12111212221002 is a wasteful number, since it uses less digits than its factorization.

12111212221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35412901258 (or 35412901255 counting only the distinct ones).

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

Adding to 12111212221002 its reverse (20012221211121), we get a palindrome (32123433432123).

The spelling of 12111212221002 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, two".