13221312110021 has 4 divisors (see below), whose sum is σ = 13470770829132. Its totient is φ = 12971853390912.

The previous prime is 13221312109987. The next prime is 13221312110059. The reversal of 13221312110021 is 12001121312231.

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 10099779340225 + 3121532769796 = 3178015^2 + 1766786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221312110021 is a prime.

It is a super-3 number, since 3×13221312110021³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13221312109975 and 13221312110002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221312110081) 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, 124729359476 + ... + 124729359581.

It is an arithmetic number, because the mean of its divisors is an integer number (3367692707283).

Almost surely, 2^{13221312110021} is an apocalyptic number.

It is an amenable number.

13221312110021 is a deficient number, since it is larger than the sum of its proper divisors (249458719111).

13221312110021 is an equidigital number, since it uses as much as digits as its factorization.

13221312110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249458719110.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 13221312110021 its reverse (12001121312231), we get a palindrome (25222433422252).

The spelling of 13221312110021 in words is "thirteen trillion, two hundred twenty-one billion, three hundred twelve million, one hundred ten thousand, twenty-one".