12111212100 has 72 divisors (see below), whose sum is σ = 37737306880. Its totient is φ = 2981220480.

The previous prime is 12111212093. The next prime is 12111212101. The reversal of 12111212100 is 121211121.

12111212100 = T₁₀₂₆₃ + T₁₀₂₆₄ + ... + T₁₀₄₈₇.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (12111212101) 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, 1548820 + ... + 1556619.

Almost surely, 2^12111212100 is an apocalyptic number.

12111212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111212100 is an abundant number, since it is smaller than the sum of its proper divisors (25626094780).

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

12111212100 is a wasteful number, since it uses less digits than its factorization.

12111212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105469 (or 3105462 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12111212100 its reverse (121211121), we get a palindrome (12232423221).

The spelling of 12111212100 in words is "twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred".