1212120111100 has 36 divisors (see below), whose sum is σ = 2646437490424. Its totient is φ = 481873510080.

The previous prime is 1212120111089. The next prime is 1212120111107. The reversal of 1212120111100 is 11110212121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120111107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37165299 + ... + 37197898.

Almost surely, 2^{1212120111100} is an apocalyptic number.

1212120111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212120111100 is an abundant number, since it is smaller than the sum of its proper divisors (1434317379324).

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

1212120111100 is a wasteful number, since it uses less digits than its factorization.

1212120111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74363374 (or 74363367 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1212120111100 its reverse (11110212121), we get a palindrome (1223230323221).

The spelling of 1212120111100 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, one hundred".