13123403421 has 16 divisors (see below), whose sum is σ = 17789361408. Its totient is φ = 8603265600.

The previous prime is 13123403413. The next prime is 13123403429. The reversal of 13123403421 is 12430432131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13123403413) and next prime (13123403429).

It is not a de Polignac number, because 13123403421 - 2³ = 13123403413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13123403391 and 13123403400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123403429) 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, 978060 + ... + 991386.

It is an arithmetic number, because the mean of its divisors is an integer number (1111835088).

Almost surely, 2^13123403421 is an apocalyptic number.

It is an amenable number.

13123403421 is a deficient number, since it is larger than the sum of its proper divisors (4665957987).

13123403421 is a wasteful number, since it uses less digits than its factorization.

13123403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18772.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 13123403421 its reverse (12430432131), we get a palindrome (25553835552).

The spelling of 13123403421 in words is "thirteen billion, one hundred twenty-three million, four hundred three thousand, four hundred twenty-one".