13123204431421 has 4 divisors (see below), whose sum is σ = 14997947921632. Its totient is φ = 11248460941212.

The previous prime is 13123204431397. The next prime is 13123204431439. The reversal of 13123204431421 is 12413440232131.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 13123204431421 - 2¹³ = 13123204423229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123204432421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937371745095 + ... + 937371745108.

It is an arithmetic number, because the mean of its divisors is an integer number (3749486980408).

Almost surely, 2^{13123204431421} is an apocalyptic number.

It is an amenable number.

13123204431421 is a deficient number, since it is larger than the sum of its proper divisors (1874743490211).

13123204431421 is an equidigital number, since it uses as much as digits as its factorization.

13123204431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874743490210.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 13123204431421 its reverse (12413440232131), we get a palindrome (25536644663552).

The spelling of 13123204431421 in words is "thirteen trillion, one hundred twenty-three billion, two hundred four million, four hundred thirty-one thousand, four hundred twenty-one".