1221200021209 has 8 divisors (see below), whose sum is σ = 1404899931008. Its totient is φ = 1039810802400.

The previous prime is 1221200021203. The next prime is 1221200021221. The reversal of 1221200021209 is 9021200021221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221200021209 - 2⁷ = 1221200021081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221200021209.

It is not an unprimeable number, because it can be changed into a prime (1221200021203) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 577671612 + ... + 577673725.

It is an arithmetic number, because the mean of its divisors is an integer number (175612491376).

Almost surely, 2^{1221200021209} is an apocalyptic number.

It is an amenable number.

1221200021209 is a deficient number, since it is larger than the sum of its proper divisors (183699909799).

1221200021209 is a wasteful number, since it uses less digits than its factorization.

1221200021209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155345495.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 1221200021209 in words is "one trillion, two hundred twenty-one billion, two hundred million, twenty-one thousand, two hundred nine".