13421657 has 4 divisors (see below), whose sum is σ = 14128080. Its totient is φ = 12715236.

The previous prime is 13421651. The next prime is 13421671. The reversal of 13421657 is 75612431.

13421657 is digitally balanced in base 2, 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: 75612431 = 23 ⋅3287497.

It is a cyclic number.

It is not a de Polignac number, because 13421657 - 2¹² = 13417561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421651) 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, 353183 + ... + 353220.

It is an arithmetic number, because the mean of its divisors is an integer number (3532020).

Almost surely, 2^13421657 is an apocalyptic number.

It is an amenable number.

13421657 is a deficient number, since it is larger than the sum of its proper divisors (706423).

13421657 is an equidigital number, since it uses as much as digits as its factorization.

13421657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706422.

The product of its digits is 5040, while the sum is 29.

The square root of 13421657 is about 3663.5579700613. The cubic root of 13421657 is about 237.6486648175.

The spelling of 13421657 in words is "thirteen million, four hundred twenty-one thousand, six hundred fifty-seven".