12012021100 has 36 divisors (see below), whose sum is σ = 26396053600. Its totient is φ = 4743984960.

The previous prime is 12012021089. The next prime is 12012021107. The reversal of 12012021100 is 112021021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (12012021107) 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, 752355 + ... + 768154.

Almost surely, 2^12012021100 is an apocalyptic number.

12012021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012021100 is an abundant number, since it is smaller than the sum of its proper divisors (14384032500).

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

12012021100 is a wasteful number, since it uses less digits than its factorization.

12012021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520602 (or 1520595 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12012021100 its reverse (112021021), we get a palindrome (12124042121).

The spelling of 12012021100 in words is "twelve billion, twelve million, twenty-one thousand, one hundred".