11215121 has 4 divisors (see below), whose sum is σ = 11874852. Its totient is φ = 10555392.

The previous prime is 11215117. The next prime is 11215129. The reversal of 11215121 is 12151211.

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 9834496 + 1380625 = 3136^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 11215121 - 2² = 11215117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11215096 and 11215105.

It is not an unprimeable number, because it can be changed into a prime (11215129) 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, 329840 + ... + 329873.

It is an arithmetic number, because the mean of its divisors is an integer number (2968713).

Almost surely, 2^11215121 is an apocalyptic number.

It is an amenable number.

11215121 is a deficient number, since it is larger than the sum of its proper divisors (659731).

11215121 is an equidigital number, since it uses as much as digits as its factorization.

11215121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659730.

The product of its digits is 20, while the sum is 14.

The square root of 11215121 is about 3348.8984756185. The cubic root of 11215121 is about 223.8384318010.

Adding to 11215121 its reverse (12151211), we get a palindrome (23366332).

The spelling of 11215121 in words is "eleven million, two hundred fifteen thousand, one hundred twenty-one".