1211444221 has 12 divisors (see below), whose sum is σ = 1317072960. Its totient is φ = 1113762000.

The previous prime is 1211444189. The next prime is 1211444249. The reversal of 1211444221 is 1224441121.

It is not a de Polignac number, because 1211444221 - 2⁵ = 1211444189 is a prime.

It is a super-3 number, since 3×1211444221³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211444192 and 1211444201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211444321) 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 11 ways as a sum of consecutive naturals, for example, 28140 + ... + 56698.

It is an arithmetic number, because the mean of its divisors is an integer number (109756080).

Almost surely, 2^1211444221 is an apocalyptic number.

It is an amenable number.

1211444221 is a deficient number, since it is larger than the sum of its proper divisors (105628739).

1211444221 is a wasteful number, since it uses less digits than its factorization.

1211444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28836 (or 28823 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 1211444221 is about 34805.8072884397. The cubic root of 1211444221 is about 1066.0260255395.

Adding to 1211444221 its reverse (1224441121), we get a palindrome (2435885342).

The spelling of 1211444221 in words is "one billion, two hundred eleven million, four hundred forty-four thousand, two hundred twenty-one".