11213052221 has 16 divisors (see below), whose sum is σ = 12886853760. Its totient is φ = 9557373120.

The previous prime is 11213052199. The next prime is 11213052233. The reversal of 11213052221 is 12225031211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11213052221 is a prime.

It is a super-2 number, since 2×11213052221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11213052193 and 11213052202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213052271) 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, 1043486 + ... + 1054176.

It is an arithmetic number, because the mean of its divisors is an integer number (805428360).

Almost surely, 2^11213052221 is an apocalyptic number.

It is an amenable number.

11213052221 is a deficient number, since it is larger than the sum of its proper divisors (1673801539).

11213052221 is a wasteful number, since it uses less digits than its factorization.

11213052221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 11213052221 its reverse (12225031211), we get a palindrome (23438083432).

The spelling of 11213052221 in words is "eleven billion, two hundred thirteen million, fifty-two thousand, two hundred twenty-one".