121220000100 has 54 divisors (see below), whose sum is σ = 379957358690. Its totient is φ = 32325333120.

The previous prime is 121220000059. The next prime is 121220000123. The reversal of 121220000100 is 1000022121.

It can be written as a sum of positive squares in 3 ways, for example, as 24321026304 + 96898973796 = 155952^2 + 311286^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67343545 + ... + 67345344.

Almost surely, 2^121220000100 is an apocalyptic number.

121220000100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220000100 is an abundant number, since it is smaller than the sum of its proper divisors (258737358590).

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

121220000100 is a wasteful number, since it uses less digits than its factorization.

121220000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134688909 (or 134688899 counting only the distinct ones).

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

Adding to 121220000100 its reverse (1000022121), we get a palindrome (122220022221).

It can be divided in two parts, 121220000 and 100, that added together give a square (121220100 = 11010²).

The spelling of 121220000100 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred", and thus it is an aban number.