12012221012100 has 72 divisors (see below), whose sum is σ = 34815594555168. Its totient is φ = 3197707315200.

The previous prime is 12012221012093. The next prime is 12012221012149. The reversal of 12012221012100 is 121012221021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12012221012100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34524246 + ... + 34870445.

Almost surely, 2^{12012221012100} is an apocalyptic number.

12012221012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012221012100 is an abundant number, since it is smaller than the sum of its proper divisors (22803373543068).

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

12012221012100 is a wasteful number, since it uses less digits than its factorization.

12012221012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69395285 (or 69395278 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12012221012100 its reverse (121012221021), we get a palindrome (12133233233121).

The spelling of 12012221012100 in words is "twelve trillion, twelve billion, two hundred twenty-one million, twelve thousand, one hundred".