1211221030321 has 16 divisors (see below), whose sum is σ = 1271780545536. Its totient is φ = 1151321274576.

The previous prime is 1211221030319. The next prime is 1211221030399. The reversal of 1211221030321 is 1230301221121.

It is a cyclic number.

It is not a de Polignac number, because 1211221030321 - 2¹ = 1211221030319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211221036321) 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, 56160486 + ... + 56182048.

It is an arithmetic number, because the mean of its divisors is an integer number (79486284096).

Almost surely, 2^{1211221030321} is an apocalyptic number.

It is an amenable number.

1211221030321 is a deficient number, since it is larger than the sum of its proper divisors (60559515215).

1211221030321 is a wasteful number, since it uses less digits than its factorization.

1211221030321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36732.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1211221030321 its reverse (1230301221121), we get a palindrome (2441522251442).

The spelling of 1211221030321 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, thirty thousand, three hundred twenty-one".