10811521 has 4 divisors (see below), whose sum is σ = 12356032. Its totient is φ = 9267012.

The previous prime is 10811503. The next prime is 10811531. The reversal of 10811521 is 12511801.

It is a happy number.

10811521 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: 12511801 = 157 ⋅79693.

It is a cyclic number.

It is not a de Polignac number, because 10811521 - 2¹⁵ = 10778753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10811531) 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, 772245 + ... + 772258.

It is an arithmetic number, because the mean of its divisors is an integer number (3089008).

Almost surely, 2^10811521 is an apocalyptic number.

It is an amenable number.

10811521 is a deficient number, since it is larger than the sum of its proper divisors (1544511).

10811521 is an equidigital number, since it uses as much as digits as its factorization.

10811521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544510.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 10811521 is about 3288.0877421383. The cubic root of 10811521 is about 221.1204614803.

The spelling of 10811521 in words is "ten million, eight hundred eleven thousand, five hundred twenty-one".