11170021 has 4 divisors (see below), whose sum is σ = 11251692. Its totient is φ = 11088352.

The previous prime is 11170001. The next prime is 11170063. The reversal of 11170021 is 12007111.

11170021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 8767521 + 2402500 = 2961^2 + 1550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11170021 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11169983 and 11170010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11170001) 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, 40630 + ... + 40903.

It is an arithmetic number, because the mean of its divisors is an integer number (2812923).

Almost surely, 2^11170021 is an apocalyptic number.

It is an amenable number.

11170021 is a deficient number, since it is larger than the sum of its proper divisors (81671).

11170021 is an equidigital number, since it uses as much as digits as its factorization.

11170021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81670.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 11170021 is about 3342.1581350977. The cubic root of 11170021 is about 223.5379839918.

Adding to 11170021 its reverse (12007111), we get a palindrome (23177132).

The spelling of 11170021 in words is "eleven million, one hundred seventy thousand, twenty-one".