1211204344321 has 8 divisors (see below), whose sum is σ = 1246275650664. Its totient is φ = 1176585571200.

The previous prime is 1211204344279. The next prime is 1211204344369. The reversal of 1211204344321 is 1234434021121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 301279134321 + 909925210000 = 548889^2 + 953900^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211204344321 - 2²¹ = 1211202247169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211204344321.

It is not an unprimeable number, because it can be changed into a prime (1211204342321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113127876 + ... + 113138581.

It is an arithmetic number, because the mean of its divisors is an integer number (155784456333).

Almost surely, 2^{1211204344321} is an apocalyptic number.

It is an amenable number.

1211204344321 is a deficient number, since it is larger than the sum of its proper divisors (35071306343).

1211204344321 is a wasteful number, since it uses less digits than its factorization.

1211204344321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226266611.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1211204344321 its reverse (1234434021121), we get a palindrome (2445638365442).

The spelling of 1211204344321 in words is "one trillion, two hundred eleven billion, two hundred four million, three hundred forty-four thousand, three hundred twenty-one".