1311033210021 has 6 divisors (see below), whose sum is σ = 1893714636710. Its totient is φ = 874022140008.

The previous prime is 1311033210007. The next prime is 1311033210041. The reversal of 1311033210021 is 1200123301131.

1311033210021 is a `hidden beast` number, since 1 + 311 + 0 + 332 + 1 + 0 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 665880480225 + 645152729796 = 816015^2 + 803214^2 .

It is not a de Polignac number, because 1311033210021 - 2¹⁰ = 1311033208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311033209976 and 1311033210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311033210041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72835178326 + ... + 72835178343.

Almost surely, 2^{1311033210021} is an apocalyptic number.

It is an amenable number.

1311033210021 is a deficient number, since it is larger than the sum of its proper divisors (582681426689).

1311033210021 is a wasteful number, since it uses less digits than its factorization.

1311033210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145670356675 (or 145670356672 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 1311033210021 its reverse (1200123301131), we get a palindrome (2511156511152).

The spelling of 1311033210021 in words is "one trillion, three hundred eleven billion, thirty-three million, two hundred ten thousand, twenty-one".