13750421 has 4 divisors (see below), whose sum is σ = 14122092. Its totient is φ = 13378752.

The previous prime is 13750393. The next prime is 13750423. The reversal of 13750421 is 12405731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12405731 = 13 ⋅954287.

It can be written as a sum of positive squares in 2 ways, for example, as 7349521 + 6400900 = 2711^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 13750421 - 2¹⁴ = 13734037 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 (13750423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185780 + ... + 185853.

It is an arithmetic number, because the mean of its divisors is an integer number (3530523).

Almost surely, 2^13750421 is an apocalyptic number.

It is an amenable number.

13750421 is a deficient number, since it is larger than the sum of its proper divisors (371671).

13750421 is an equidigital number, since it uses as much as digits as its factorization.

13750421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371670.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 13750421 is about 3708.1560107417. The cubic root of 13750421 is about 239.5734379043.

The spelling of 13750421 in words is "thirteen million, seven hundred fifty thousand, four hundred twenty-one".