13231313021 has 8 divisors (see below), whose sum is σ = 13289739960. Its totient is φ = 13172963328.

The previous prime is 13231312987. The next prime is 13231313041. The reversal of 13231313021 is 12031313231.

13231313021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4842768100 + 8388544921 = 69590^2 + 91589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231313021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13231312984 and 13231313002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231313041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338525 + ... + 375581.

It is an arithmetic number, because the mean of its divisors is an integer number (1661217495).

Almost surely, 2^13231313021 is an apocalyptic number.

It is an amenable number.

13231313021 is a deficient number, since it is larger than the sum of its proper divisors (58426939).

13231313021 is a wasteful number, since it uses less digits than its factorization.

13231313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38623.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13231313021 its reverse (12031313231), we get a palindrome (25262626252).

The spelling of 13231313021 in words is "thirteen billion, two hundred thirty-one million, three hundred thirteen thousand, twenty-one".