121211200100 has 36 divisors (see below), whose sum is σ = 263044341168. Its totient is φ = 48481524000.

The previous prime is 121211200091. The next prime is 121211200109. The reversal of 121211200100 is 1002112121.

It is an interprime number because it is at equal distance from previous prime (121211200091) and next prime (121211200109).

It is not an unprimeable number, because it can be changed into a prime (121211200109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2432435 + ... + 2481765.

Almost surely, 2^121211200100 is an apocalyptic number.

121211200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211200100 is an abundant number, since it is smaller than the sum of its proper divisors (141833141068).

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

121211200100 is a wasteful number, since it uses less digits than its factorization.

121211200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73916 (or 73909 counting only the distinct ones).

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

Adding to 121211200100 its reverse (1002112121), we get a palindrome (122213312221).

The spelling of 121211200100 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thousand, one hundred".