1221132201221 has 16 divisors (see below), whose sum is σ = 1231878000000. Its totient is φ = 1210422989376.

The previous prime is 1221132201203. The next prime is 1221132201239. The reversal of 1221132201221 is 1221022311221.

It is an interprime number because it is at equal distance from previous prime (1221132201203) and next prime (1221132201239).

It is a de Polignac number, because none of the positive numbers 2^k-1221132201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221132201193 and 1221132201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132201251) 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, 196985480 + ... + 196991678.

It is an arithmetic number, because the mean of its divisors is an integer number (76992375000).

Almost surely, 2^{1221132201221} is an apocalyptic number.

It is an amenable number.

1221132201221 is a deficient number, since it is larger than the sum of its proper divisors (10745798779).

1221132201221 is a wasteful number, since it uses less digits than its factorization.

1221132201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8876.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221132201221 its reverse (1221022311221), we get a palindrome (2442154512442).

The spelling of 1221132201221 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred one thousand, two hundred twenty-one".