11172121 has 4 divisors (see below), whose sum is σ = 11532544. Its totient is φ = 10811700.

The previous prime is 11172079. The next prime is 11172127. The reversal of 11172121 is 12127111.

11172121 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, 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: 12127111 = 19 ⋅638269.

It is a cyclic number.

It is not a de Polignac number, because 11172121 - 2¹¹ = 11170073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11172095 and 11172104.

It is not an unprimeable number, because it can be changed into a prime (11172127) 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, 180165 + ... + 180226.

It is an arithmetic number, because the mean of its divisors is an integer number (2883136).

Almost surely, 2^11172121 is an apocalyptic number.

It is an amenable number.

11172121 is a deficient number, since it is larger than the sum of its proper divisors (360423).

11172121 is an equidigital number, since it uses as much as digits as its factorization.

11172121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360422.

The product of its digits is 28, while the sum is 16.

The square root of 11172121 is about 3342.4722885912. The cubic root of 11172121 is about 223.5519917348.

Adding to 11172121 its reverse (12127111), we get a palindrome (23299232).

The spelling of 11172121 in words is "eleven million, one hundred seventy-two thousand, one hundred twenty-one".