12201020100 has 108 divisors (see below), whose sum is σ = 39277132804. Its totient is φ = 3165661440.

The previous prime is 12201020093. The next prime is 12201020149. The reversal of 12201020100 is 102010221.

It can be written as a sum of positive squares in 6 ways, for example, as 259338816 + 11941681284 = 16104^2 + 109278^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149899 + ... + 216498.

Almost surely, 2^12201020100 is an apocalyptic number.

12201020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12201020100 is an abundant number, since it is smaller than the sum of its proper divisors (27076112704).

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

12201020100 is a wasteful number, since it uses less digits than its factorization.

12201020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366454 (or 366444 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12201020100 its reverse (102010221), we get a palindrome (12303030321).

The spelling of 12201020100 in words is "twelve billion, two hundred one million, twenty thousand, one hundred".