13031230222121 has 4 divisors (see below), whose sum is σ = 13031238946644. Its totient is φ = 13031221497600.

The previous prime is 13031230222117. The next prime is 13031230222177. The reversal of 13031230222121 is 12122203213031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7305068378521 + 5726161843600 = 2702789^2 + 2392940^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031230222121 - 2² = 13031230222117 is a prime.

It is a super-2 number, since 2×13031230222121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13031230252121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492520 + ... + 5318841.

It is an arithmetic number, because the mean of its divisors is an integer number (3257809736661).

Almost surely, 2^{13031230222121} is an apocalyptic number.

It is an amenable number.

13031230222121 is a deficient number, since it is larger than the sum of its proper divisors (8724523).

13031230222121 is an equidigital number, since it uses as much as digits as its factorization.

13031230222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724522.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 13031230222121 its reverse (12122203213031), we get a palindrome (25153433435152).

The spelling of 13031230222121 in words is "thirteen trillion, thirty-one billion, two hundred thirty million, two hundred twenty-two thousand, one hundred twenty-one".