13021457 has 4 divisors (see below), whose sum is σ = 13441536. Its totient is φ = 12601380.

The previous prime is 13021453. The next prime is 13021469. The reversal of 13021457 is 75412031.

13021457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75412031 = 37 ⋅2038163.

It is a cyclic number.

It is not a de Polignac number, because 13021457 - 2² = 13021453 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13021451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209993 + ... + 210054.

It is an arithmetic number, because the mean of its divisors is an integer number (3360384).

Almost surely, 2^13021457 is an apocalyptic number.

It is an amenable number.

13021457 is a deficient number, since it is larger than the sum of its proper divisors (420079).

13021457 is an equidigital number, since it uses as much as digits as its factorization.

13021457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420078.

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

The square root of 13021457 is about 3608.5255991887. The cubic root of 13021457 is about 235.2627632742.

Adding to 13021457 its reverse (75412031), we get a palindrome (88433488).

The spelling of 13021457 in words is "thirteen million, twenty-one thousand, four hundred fifty-seven".