12021212111100 has 72 divisors (see below), whose sum is σ = 34874621683440. Its totient is φ = 3197062279680.

The previous prime is 12021212111039. The next prime is 12021212111101. The reversal of 12021212111100 is 111121212021.

It is a happy number.

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 12021212111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021212111101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53602185 + ... + 53825984.

Almost surely, 2^{12021212111100} is an apocalyptic number.

12021212111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021212111100 is an abundant number, since it is smaller than the sum of its proper divisors (22853409572340).

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

12021212111100 is a wasteful number, since it uses less digits than its factorization.

12021212111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107428559 (or 107428552 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12021212111100 its reverse (111121212021), we get a palindrome (12132333323121).

The spelling of 12021212111100 in words is "twelve trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred".