11213121 has 16 divisors (see below), whose sum is σ = 15765120. Its totient is φ = 7075200.

The previous prime is 11213117. The next prime is 11213123. The reversal of 11213121 is 12131211.

It is not a de Polignac number, because 11213121 - 2² = 11213117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11213097 and 11213106.

It is not an unprimeable number, because it can be changed into a prime (11213123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6165 + ... + 7773.

It is an arithmetic number, because the mean of its divisors is an integer number (985320).

Almost surely, 2^11213121 is an apocalyptic number.

It is an amenable number.

11213121 is a deficient number, since it is larger than the sum of its proper divisors (4551999).

11213121 is a wasteful number, since it uses less digits than its factorization.

11213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736.

The product of its digits is 12, while the sum is 12.

The square root of 11213121 is about 3348.5998566565. The cubic root of 11213121 is about 223.8251252577.

Adding to 11213121 its reverse (12131211), we get a palindrome (23344332).

The spelling of 11213121 in words is "eleven million, two hundred thirteen thousand, one hundred twenty-one".