11217021 has 16 divisors (see below), whose sum is σ = 15360000. Its totient is φ = 7278768.

The previous prime is 11217007. The next prime is 11217043. The reversal of 11217021 is 12071211.

It is not a de Polignac number, because 11217021 - 2¹³ = 11208829 is a prime.

It is a super-2 number, since 2×11217021² = 251643120228882, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22230 + ... + 22728.

It is an arithmetic number, because the mean of its divisors is an integer number (960000).

Almost surely, 2^11217021 is an apocalyptic number.

It is an amenable number.

11217021 is a deficient number, since it is larger than the sum of its proper divisors (4142979).

11217021 is a wasteful number, since it uses less digits than its factorization.

11217021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 11217021 is about 3349.1821389706. The cubic root of 11217021 is about 223.8510715518.

Adding to 11217021 its reverse (12071211), we get a palindrome (23288232).

The spelling of 11217021 in words is "eleven million, two hundred seventeen thousand, twenty-one".