11215442221 has 8 divisors (see below), whose sum is σ = 11301960384. Its totient is φ = 11129256960.

The previous prime is 11215442207. The next prime is 11215442269. The reversal of 11215442221 is 12224451211.

11215442221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11215442221 - 2⁷ = 11215442093 is a prime.

It is a super-2 number, since 2×11215442221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215422221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15375 + ... + 150556.

It is an arithmetic number, because the mean of its divisors is an integer number (1412745048).

Almost surely, 2^11215442221 is an apocalyptic number.

It is an amenable number.

11215442221 is a deficient number, since it is larger than the sum of its proper divisors (86518163).

11215442221 is a wasteful number, since it uses less digits than its factorization.

11215442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166451.

The product of its digits is 1280, while the sum is 25.

Adding to 11215442221 its reverse (12224451211), we get a palindrome (23439893432).

The spelling of 11215442221 in words is "eleven billion, two hundred fifteen million, four hundred forty-two thousand, two hundred twenty-one".