121221021220200 has 192 divisors, whose sum is σ = 455497170868800. Its totient is φ = 29386914220800.

The previous prime is 121221021220171. The next prime is 121221021220253. The reversal of 121221021220200 is 2022120122121.

It is a happy number.

121221021220200 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 0 + 21 + 220 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1020319567 + ... + 1020438366.

It is an arithmetic number, because the mean of its divisors is an integer number (2372381098275).

Almost surely, 2^{121221021220200} is an apocalyptic number.

121221021220200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021220200 is an abundant number, since it is smaller than the sum of its proper divisors (334276149648600).

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

121221021220200 is a wasteful number, since it uses less digits than its factorization.

121221021220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040757969 (or 2040757954 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221021220200 its reverse (2022120122121), we get a palindrome (123243141342321).

The spelling of 121221021220200 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, two hundred".