1211231203221 has 16 divisors (see below), whose sum is σ = 1814821335936. Its totient is φ = 712965523776.

The previous prime is 1211231203211. The next prime is 1211231203223. The reversal of 1211231203221 is 1223021321121.

It is not a de Polignac number, because 1211231203221 - 2¹⁰ = 1211231202197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211231203223) 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, 675155850 + ... + 675157643.

It is an arithmetic number, because the mean of its divisors is an integer number (113426333496).

Almost surely, 2^{1211231203221} is an apocalyptic number.

It is an amenable number.

1211231203221 is a deficient number, since it is larger than the sum of its proper divisors (603590132715).

1211231203221 is a wasteful number, since it uses less digits than its factorization.

1211231203221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350313532.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1211231203221 its reverse (1223021321121), we get a palindrome (2434252524342).

The spelling of 1211231203221 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, two hundred three thousand, two hundred twenty-one".