13387421 has 2 divisors, whose sum is σ = 13387422. Its totient is φ = 13387420.

The previous prime is 13387411. The next prime is 13387427. The reversal of 13387421 is 12478331.

13387421 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 348100 = 3611^2 + 590^2 .

It is an emirp because it is prime and its reverse (12478331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13387421 - 2¹⁰ = 13386397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13387427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6693710 + 6693711.

It is an arithmetic number, because the mean of its divisors is an integer number (6693711).

Almost surely, 2^13387421 is an apocalyptic number.

It is an amenable number.

13387421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13387421 is an equidigital number, since it uses as much as digits as its factorization.

13387421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 13387421 is about 3658.8824796651. The cubic root of 13387421 is about 237.4464278060.

The spelling of 13387421 in words is "thirteen million, three hundred eighty-seven thousand, four hundred twenty-one".