12121201100 has 72 divisors (see below), whose sum is σ = 26466847680. Its totient is φ = 4818401280.

The previous prime is 12121201087. The next prime is 12121201109. The reversal of 12121201100 is 110212121.

It is a super-2 number, since 2×12121201100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12121201109) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 18010364 + ... + 18011036.

Almost surely, 2^12121201100 is an apocalyptic number.

12121201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121201100 is an abundant number, since it is smaller than the sum of its proper divisors (14345646580).

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

12121201100 is a wasteful number, since it uses less digits than its factorization.

12121201100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539 (or 1532 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12121201100 its reverse (110212121), we get a palindrome (12231413221).

The spelling of 12121201100 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, one hundred".