13124042421 has 16 divisors (see below), whose sum is σ = 20001331200. Its totient is φ = 7498406448.

The previous prime is 13124042377. The next prime is 13124042447. The reversal of 13124042421 is 12424042131.

It is not a de Polignac number, because 13124042421 - 2¹⁸ = 13123780277 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13124042391 and 13124042400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13124042021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125800 + ... + 205118.

It is an arithmetic number, because the mean of its divisors is an integer number (1250083200).

Almost surely, 2^13124042421 is an apocalyptic number.

It is an amenable number.

13124042421 is a deficient number, since it is larger than the sum of its proper divisors (6877288779).

13124042421 is an equidigital number, since it uses as much as digits as its factorization.

13124042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87208.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 13124042421 its reverse (12424042131), we get a palindrome (25548084552).

The spelling of 13124042421 in words is "thirteen billion, one hundred twenty-four million, forty-two thousand, four hundred twenty-one".