1221441321211 has 16 divisors (see below), whose sum is σ = 1295985209184. Its totient is φ = 1147197579264.

The previous prime is 1221441321197. The next prime is 1221441321283. The reversal of 1221441321211 is 1121231441221.

It is a cyclic number.

It is not a de Polignac number, because 1221441321211 - 2¹⁵ = 1221441288443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221441361211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97732515 + ... + 97745011.

It is an arithmetic number, because the mean of its divisors is an integer number (80999075574).

Almost surely, 2^{1221441321211} is an apocalyptic number.

1221441321211 is a deficient number, since it is larger than the sum of its proper divisors (74543887973).

1221441321211 is a wasteful number, since it uses less digits than its factorization.

1221441321211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24030.

The product of its digits is 768, while the sum is 25.

Adding to 1221441321211 its reverse (1121231441221), we get a palindrome (2342672762432).

The spelling of 1221441321211 in words is "one trillion, two hundred twenty-one billion, four hundred forty-one million, three hundred twenty-one thousand, two hundred eleven".