121221200001000 has 256 divisors, whose sum is σ = 416677973886720. Its totient is φ = 29095996800000.

The previous prime is 121221200000909. The next prime is 121221200001023. The reversal of 121221200001000 is 100002122121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 14851999 + ... + 21517998.

It is an arithmetic number, because the mean of its divisors is an integer number (1627648335495).

Almost surely, 2^{121221200001000} is an apocalyptic number.

121221200001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221200001000 is an abundant number, since it is smaller than the sum of its proper divisors (295456773885720).

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

121221200001000 is a wasteful number, since it uses less digits than its factorization.

121221200001000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370133 (or 36370119 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121221200001000 its reverse (100002122121), we get a palindrome (121321202123121).

The spelling of 121221200001000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred million, one thousand".