1211343301331 has 16 divisors (see below), whose sum is σ = 1225019593728. Its totient is φ = 1197712656000.

The previous prime is 1211343301303. The next prime is 1211343301349. The reversal of 1211343301331 is 1331033431121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1211343301331 - 2³⁰ = 1210269559507 is a prime.

It is a super-2 number, since 2×1211343301331² (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 1211343301331.

It is not an unprimeable number, because it can be changed into a prime (1211343201331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186903611 + ... + 186910091.

It is an arithmetic number, because the mean of its divisors is an integer number (76563724608).

Almost surely, 2^{1211343301331} is an apocalyptic number.

1211343301331 is a deficient number, since it is larger than the sum of its proper divisors (13676292397).

1211343301331 is a wasteful number, since it uses less digits than its factorization.

1211343301331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9682.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 1211343301331 its reverse (1331033431121), we get a palindrome (2542376732452).

The spelling of 1211343301331 in words is "one trillion, two hundred eleven billion, three hundred forty-three million, three hundred one thousand, three hundred thirty-one".