1211320121313 has 48 divisors (see below), whose sum is σ = 1743535632384. Its totient is φ = 747216798240.

The previous prime is 1211320121303. The next prime is 1211320121351. The reversal of 1211320121313 is 3131210231121.

It is not a de Polignac number, because 1211320121313 - 2¹⁰ = 1211320120289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211320121313.

It is not an unprimeable number, because it can be changed into a prime (1211320121303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228419020 + ... + 228424322.

It is an arithmetic number, because the mean of its divisors is an integer number (36323659008).

Almost surely, 2^{1211320121313} is an apocalyptic number.

It is an amenable number.

1211320121313 is a deficient number, since it is larger than the sum of its proper divisors (532215511071).

1211320121313 is a wasteful number, since it uses less digits than its factorization.

1211320121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10026 (or 10003 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1211320121313 its reverse (3131210231121), we get a palindrome (4342530352434).

The spelling of 1211320121313 in words is "one trillion, two hundred eleven billion, three hundred twenty million, one hundred twenty-one thousand, three hundred thirteen".