13311131023021 has 4 divisors (see below), whose sum is σ = 14335064178652. Its totient is φ = 12287197867392.

The previous prime is 13311131023019. The next prime is 13311131023067. The reversal of 13311131023021 is 12032013111331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1339600222921 + 11971530800100 = 1157411^2 + 3459990^2 .

It is a cyclic number.

It is not a de Polignac number, because 13311131023021 - 2¹ = 13311131023019 is a prime.

It is a super-2 number, since 2×13311131023021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13311131022983 and 13311131023001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311131023121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511966577796 + ... + 511966577821.

It is an arithmetic number, because the mean of its divisors is an integer number (3583766044663).

Almost surely, 2^{13311131023021} is an apocalyptic number.

It is an amenable number.

13311131023021 is a deficient number, since it is larger than the sum of its proper divisors (1023933155631).

13311131023021 is a wasteful number, since it uses less digits than its factorization.

13311131023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023933155630.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 13311131023021 its reverse (12032013111331), we get a palindrome (25343144134352).

The spelling of 13311131023021 in words is "thirteen trillion, three hundred eleven billion, one hundred thirty-one million, twenty-three thousand, twenty-one".