1221000210201 has 16 divisors (see below), whose sum is σ = 1650853207808. Its totient is φ = 802635609600.

The previous prime is 1221000210173. The next prime is 1221000210211. The reversal of 1221000210201 is 1020120001221.

It is not a de Polignac number, because 1221000210201 - 2¹⁴ = 1221000193817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221000210211) 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 15 ways as a sum of consecutive naturals, for example, 7662610 + ... + 7820331.

It is an arithmetic number, because the mean of its divisors is an integer number (103178325488).

Almost surely, 2^{1221000210201} is an apocalyptic number.

It is an amenable number.

1221000210201 is a deficient number, since it is larger than the sum of its proper divisors (429852997607).

1221000210201 is a wasteful number, since it uses less digits than its factorization.

1221000210201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15483312.

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

Adding to 1221000210201 its reverse (1020120001221), we get a palindrome (2241120211422).

The spelling of 1221000210201 in words is "one trillion, two hundred twenty-one billion, two hundred ten thousand, two hundred one".