12211100100 has 54 divisors (see below), whose sum is σ = 38275017690. Its totient is φ = 3256293120.

The previous prime is 12211100009. The next prime is 12211100147. The reversal of 12211100100 is 100111221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 739404864 + 11471695236 = 27192^2 + 107106^2 .

It is a super-2 number, since 2×12211100100² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6783045 + ... + 6784844.

Almost surely, 2^12211100100 is an apocalyptic number.

12211100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211100100 is an abundant number, since it is smaller than the sum of its proper divisors (26063917590).

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

12211100100 is a wasteful number, since it uses less digits than its factorization.

12211100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13567909 (or 13567899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12211100100 its reverse (100111221), we get a palindrome (12311211321).

The spelling of 12211100100 in words is "twelve billion, two hundred eleven million, one hundred thousand, one hundred".