1212203201100 has 36 divisors (see below), whose sum is σ = 3507307929384. Its totient is φ = 323254186880.

The previous prime is 1212203201087. The next prime is 1212203201149. The reversal of 1212203201100 is 11023022121.

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 1212203201100.

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, 2020338369 + ... + 2020338968.

Almost surely, 2^{1212203201100} is an apocalyptic number.

1212203201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212203201100 is an abundant number, since it is smaller than the sum of its proper divisors (2295104728284).

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

1212203201100 is a wasteful number, since it uses less digits than its factorization.

1212203201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040677354 (or 4040677347 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1212203201100 its reverse (11023022121), we get a palindrome (1223226223221).

The spelling of 1212203201100 in words is "one trillion, two hundred twelve billion, two hundred three million, two hundred one thousand, one hundred".