121221020200100 has 18 divisors (see below), whose sum is σ = 263049613834434. Its totient is φ = 48488408080000.

The previous prime is 121221020200099. The next prime is 121221020200121. The reversal of 121221020200100 is 1002020122121.

It can be written as a sum of positive squares in 3 ways, for example, as 6896852906596 + 114324167293504 = 2626186^2 + 10692248^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606105100901 + ... + 606105101100.

Almost surely, 2^{121221020200100} is an apocalyptic number.

121221020200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221020200100 is an abundant number, since it is smaller than the sum of its proper divisors (141828593634334).

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

121221020200100 is a wasteful number, since it uses less digits than its factorization.

121221020200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212210202015 (or 1212210202008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221020200100 its reverse (1002020122121), we get a palindrome (122223040322221).

The spelling of 121221020200100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, one hundred".