1221322001201 has 4 divisors (see below), whose sum is σ = 1222328863092. Its totient is φ = 1220315139312.

The previous prime is 1221322001177. The next prime is 1221322001209. The reversal of 1221322001201 is 1021002231221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20894991601 + 1200427009600 = 144551^2 + 1095640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221322001201 - 2¹⁰ = 1221322000177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221322001201.

It is not an unprimeable number, because it can be changed into a prime (1221322001209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503429126 + ... + 503431551.

It is an arithmetic number, because the mean of its divisors is an integer number (305582215773).

Almost surely, 2^{1221322001201} is an apocalyptic number.

It is an amenable number.

1221322001201 is a deficient number, since it is larger than the sum of its proper divisors (1006861891).

1221322001201 is a wasteful number, since it uses less digits than its factorization.

1221322001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006861890.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221322001201 its reverse (1021002231221), we get a palindrome (2242324232422).

The spelling of 1221322001201 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two million, one thousand, two hundred one".