1200020121221 has 8 divisors (see below), whose sum is σ = 1238899653888. Its totient is φ = 1161151164000.

The previous prime is 1200020121211. The next prime is 1200020121247. The reversal of 1200020121221 is 1221210200021.

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 1200020121221 - 2¹⁰ = 1200020120197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200020121196 and 1200020121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200020121211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2412920 + ... + 2867441.

It is an arithmetic number, because the mean of its divisors is an integer number (154862456736).

Almost surely, 2^{1200020121221} is an apocalyptic number.

It is an amenable number.

1200020121221 is a deficient number, since it is larger than the sum of its proper divisors (38879532667).

1200020121221 is an equidigital number, since it uses as much as digits as its factorization.

1200020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287723.

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

Adding to 1200020121221 its reverse (1221210200021), we get a palindrome (2421230321242).

The spelling of 1200020121221 in words is "one trillion, two hundred billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".