11521357 has 4 divisors (see below), whose sum is σ = 11546496. Its totient is φ = 11496220.

The previous prime is 11521351. The next prime is 11521361. The reversal of 11521357 is 75312511.

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: 75312511 = 23 ⋅3274457.

It is a cyclic number.

It is not a de Polignac number, because 11521357 - 2¹¹ = 11519309 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 (11521351) 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, 11869 + ... + 12802.

It is an arithmetic number, because the mean of its divisors is an integer number (2886624).

Almost surely, 2^11521357 is an apocalyptic number.

It is an amenable number.

11521357 is a deficient number, since it is larger than the sum of its proper divisors (25139).

11521357 is an equidigital number, since it uses as much as digits as its factorization.

11521357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25138.

The product of its digits is 1050, while the sum is 25.

The square root of 11521357 is about 3394.3124487884. The cubic root of 11521357 is about 225.8575145408.

Adding to 11521357 its reverse (75312511), we get a palindrome (86833868).

The spelling of 11521357 in words is "eleven million, five hundred twenty-one thousand, three hundred fifty-seven".