1211550304321 has 8 divisors (see below), whose sum is σ = 1405295023040. Its totient is φ = 1022972111568.

The previous prime is 1211550304297. The next prime is 1211550304351. The reversal of 1211550304321 is 1234030551121.

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 1211550304321 - 2¹³ = 1211550296129 is a prime.

It is a super-2 number, since 2×1211550304321² (a number of 25 digits) contains 22 as substring.

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 1211550304321.

It is not an unprimeable number, because it can be changed into a prime (1211550304351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291630986 + ... + 1291631923.

It is an arithmetic number, because the mean of its divisors is an integer number (175661877880).

Almost surely, 2^{1211550304321} is an apocalyptic number.

It is an amenable number.

1211550304321 is a deficient number, since it is larger than the sum of its proper divisors (193744718719).

1211550304321 is an equidigital number, since it uses as much as digits as its factorization.

1211550304321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583262983.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1211550304321 its reverse (1234030551121), we get a palindrome (2445580855442).

The spelling of 1211550304321 in words is "one trillion, two hundred eleven billion, five hundred fifty million, three hundred four thousand, three hundred twenty-one".