13210042421 has 4 divisors (see below), whose sum is σ = 13230978144. Its totient is φ = 13189106700.

The previous prime is 13210042409. The next prime is 13210042499. The reversal of 13210042421 is 12424001231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12424001231 = 9689 ⋅1282279.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13210042421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13210042393 and 13210042402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13210042621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10466915 + ... + 10468176.

It is an arithmetic number, because the mean of its divisors is an integer number (3307744536).

Almost surely, 2^13210042421 is an apocalyptic number.

It is an amenable number.

13210042421 is a deficient number, since it is larger than the sum of its proper divisors (20935723).

13210042421 is an equidigital number, since it uses as much as digits as its factorization.

13210042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20935722.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 13210042421 its reverse (12424001231), we get a palindrome (25634043652).

The spelling of 13210042421 in words is "thirteen billion, two hundred ten million, forty-two thousand, four hundred twenty-one".