13075421 has 2 divisors, whose sum is σ = 13075422. Its totient is φ = 13075420.

The previous prime is 13075409. The next prime is 13075423. The reversal of 13075421 is 12457031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 36100 = 3611^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13075421 is a prime.

Together with 13075423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13075423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6537710 + 6537711.

It is an arithmetic number, because the mean of its divisors is an integer number (6537711).

Almost surely, 2^13075421 is an apocalyptic number.

It is an amenable number.

13075421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13075421 is an equidigital number, since it uses as much as digits as its factorization.

13075421 is an evil number, because the sum of its binary digits is even.

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

The square root of 13075421 is about 3615.9951603950. The cubic root of 13075421 is about 235.5873102125.

The spelling of 13075421 in words is "thirteen million, seventy-five thousand, four hundred twenty-one".