13780105421 has 24 divisors (see below), whose sum is σ = 14455638600. Its totient is φ = 13134756096.

The previous prime is 13780105331. The next prime is 13780105441. The reversal of 13780105421 is 12450108731.

It can be written as a sum of positive squares in 12 ways, for example, as 5423586025 + 8356519396 = 73645^2 + 91414^2 .

It is not a de Polignac number, because 13780105421 - 2¹⁸ = 13779843277 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 (13780105441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34710395 + ... + 34710791.

It is an arithmetic number, because the mean of its divisors is an integer number (602318275).

Almost surely, 2^13780105421 is an apocalyptic number.

It is an amenable number.

13780105421 is a deficient number, since it is larger than the sum of its proper divisors (675533179).

13780105421 is a wasteful number, since it uses less digits than its factorization.

13780105421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 13780105421 in words is "thirteen billion, seven hundred eighty million, one hundred five thousand, four hundred twenty-one".