13436635421 has 4 divisors (see below), whose sum is σ = 14658147744. Its totient is φ = 12215123100.

The previous prime is 13436635369. The next prime is 13436635463. The reversal of 13436635421 is 12453663431.

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 13436635421 - 2⁶ = 13436635357 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 (13436632421) 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, 610756145 + ... + 610756166.

It is an arithmetic number, because the mean of its divisors is an integer number (3664536936).

Almost surely, 2^13436635421 is an apocalyptic number.

13436635421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13436635421 is a deficient number, since it is larger than the sum of its proper divisors (1221512323).

13436635421 is a wasteful number, since it uses less digits than its factorization.

13436635421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221512322.

The product of its digits is 155520, while the sum is 38.

The spelling of 13436635421 in words is "thirteen billion, four hundred thirty-six million, six hundred thirty-five thousand, four hundred twenty-one".