1221000020201 has 8 divisors (see below), whose sum is σ = 1345502706240. Its totient is φ = 1100865849552.

The previous prime is 1221000020189. The next prime is 1221000020209. The reversal of 1221000020201 is 1020200001221.

It is a happy number.

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 1221000020201 - 2³⁰ = 1219926278377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221000020209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1092128261 + ... + 1092129378.

It is an arithmetic number, because the mean of its divisors is an integer number (168187838280).

Almost surely, 2^{1221000020201} is an apocalyptic number.

It is an amenable number.

1221000020201 is a deficient number, since it is larger than the sum of its proper divisors (124502686039).

1221000020201 is a wasteful number, since it uses less digits than its factorization.

1221000020201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184257695.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1221000020201 its reverse (1020200001221), we get a palindrome (2241200021422).

The spelling of 1221000020201 in words is "one trillion, two hundred twenty-one billion, twenty thousand, two hundred one".