13421557 has 4 divisors (see below), whose sum is σ = 13458496. Its totient is φ = 13384620.

The previous prime is 13421539. The next prime is 13421563. The reversal of 13421557 is 75512431.

It is a happy number.

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: 75512431 = 1061 ⋅71171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13421557 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 (13421537) 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, 17919 + ... + 18652.

It is an arithmetic number, because the mean of its divisors is an integer number (3364624).

Almost surely, 2^13421557 is an apocalyptic number.

It is an amenable number.

13421557 is a deficient number, since it is larger than the sum of its proper divisors (36939).

13421557 is an equidigital number, since it uses as much as digits as its factorization.

13421557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36938.

The product of its digits is 4200, while the sum is 28.

The square root of 13421557 is about 3663.5443221012. The cubic root of 13421557 is about 237.6480746041.

Adding to 13421557 its reverse (75512431), we get a palindrome (88933988).

The spelling of 13421557 in words is "thirteen million, four hundred twenty-one thousand, five hundred fifty-seven".