13443621437 has 32 divisors (see below), whose sum is σ = 15861225600. Its totient is φ = 11304050688.

The previous prime is 13443621397. The next prime is 13443621533. The reversal of 13443621437 is 73412634431.

It is a cyclic number.

It is not a de Polignac number, because 13443621437 - 2¹⁶ = 13443555901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13443621437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13443621637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386093 + ... + 419469.

It is an arithmetic number, because the mean of its divisors is an integer number (495663300).

Almost surely, 2^13443621437 is an apocalyptic number.

13443621437 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13443621437 is a deficient number, since it is larger than the sum of its proper divisors (2417604163).

13443621437 is a wasteful number, since it uses less digits than its factorization.

13443621437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33485.

The product of its digits is 145152, while the sum is 38.

The spelling of 13443621437 in words is "thirteen billion, four hundred forty-three million, six hundred twenty-one thousand, four hundred thirty-seven".