13121442042421 has 32 divisors (see below), whose sum is σ = 14084842567680. Its totient is φ = 12187376510400.

The previous prime is 13121442042389. The next prime is 13121442042431. The reversal of 13121442042421 is 12424024412131.

It is a cyclic number.

It is not a de Polignac number, because 13121442042421 - 2⁵ = 13121442042389 is a prime.

It is a super-2 number, since 2×13121442042421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121442042431) 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 31 ways as a sum of consecutive naturals, for example, 348094651 + ... + 348132343.

It is an arithmetic number, because the mean of its divisors is an integer number (440151330240).

Almost surely, 2^{13121442042421} is an apocalyptic number.

It is an amenable number.

13121442042421 is a deficient number, since it is larger than the sum of its proper divisors (963400525259).

13121442042421 is a wasteful number, since it uses less digits than its factorization.

13121442042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39217.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 13121442042421 its reverse (12424024412131), we get a palindrome (25545466454552).

The spelling of 13121442042421 in words is "thirteen trillion, one hundred twenty-one billion, four hundred forty-two million, forty-two thousand, four hundred twenty-one".