13357621 has 4 divisors (see below), whose sum is σ = 13788544. Its totient is φ = 12926700.

The previous prime is 13357609. The next prime is 13357633. The reversal of 13357621 is 12675331.

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: 12675331 = 349 ⋅36319.

It is an interprime number because it is at equal distance from previous prime (13357609) and next prime (13357633).

It is a cyclic number.

It is not a de Polignac number, because 13357621 - 2⁷ = 13357493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13357621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13357681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215415 + ... + 215476.

It is an arithmetic number, because the mean of its divisors is an integer number (3447136).

Almost surely, 2^13357621 is an apocalyptic number.

It is an amenable number.

13357621 is a deficient number, since it is larger than the sum of its proper divisors (430923).

13357621 is an equidigital number, since it uses as much as digits as its factorization.

13357621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430922.

The product of its digits is 3780, while the sum is 28.

The square root of 13357621 is about 3654.8079292899. The cubic root of 13357621 is about 237.2701140285.

The spelling of 13357621 in words is "thirteen million, three hundred fifty-seven thousand, six hundred twenty-one".