13231314211021 has 4 divisors (see below), whose sum is σ = 13232019937500. Its totient is φ = 13230608484544.

The previous prime is 13231314210991. The next prime is 13231314211057. The reversal of 13231314211021 is 12011241313231.

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 3938657006025 + 9292657204996 = 1984605^2 + 3048386^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231314211021 - 2¹³ = 13231314202829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231314211081) 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, 352835116 + ... + 352872613.

It is an arithmetic number, because the mean of its divisors is an integer number (3308004984375).

Almost surely, 2^{13231314211021} is an apocalyptic number.

It is an amenable number.

13231314211021 is a deficient number, since it is larger than the sum of its proper divisors (705726479).

13231314211021 is an equidigital number, since it uses as much as digits as its factorization.

13231314211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705726478.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 13231314211021 its reverse (12011241313231), we get a palindrome (25242555524252).

The spelling of 13231314211021 in words is "thirteen trillion, two hundred thirty-one billion, three hundred fourteen million, two hundred eleven thousand, twenty-one".