1221010203201 has 16 divisors (see below), whose sum is σ = 1636311554496. Its totient is φ = 809868240896.

The previous prime is 1221010203199. The next prime is 1221010203253. The reversal of 1221010203201 is 1023020101221.

It is a cyclic number.

It is not a de Polignac number, because 1221010203201 - 2¹ = 1221010203199 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221010203901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 832200 + ... + 1770473.

It is an arithmetic number, because the mean of its divisors is an integer number (102269472156).

Almost surely, 2^{1221010203201} is an apocalyptic number.

It is an amenable number.

1221010203201 is a deficient number, since it is larger than the sum of its proper divisors (415301351295).

1221010203201 is a wasteful number, since it uses less digits than its factorization.

1221010203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603472.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1221010203201 its reverse (1023020101221), we get a palindrome (2244030304422).

The spelling of 1221010203201 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred three thousand, two hundred one".