11121201221 has 16 divisors (see below), whose sum is σ = 12239673600. Its totient is φ = 10042688448.

The previous prime is 11121201193. The next prime is 11121201263. The reversal of 11121201221 is 12210212111.

It is a de Polignac number, because none of the positive numbers 2^k-11121201221 is a prime.

It is a super-2 number, since 2×11121201221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121201196 and 11121201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121201521) 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, 62270 + ... + 161616.

It is an arithmetic number, because the mean of its divisors is an integer number (764979600).

Almost surely, 2^11121201221 is an apocalyptic number.

It is an amenable number.

11121201221 is a deficient number, since it is larger than the sum of its proper divisors (1118472379).

11121201221 is a wasteful number, since it uses less digits than its factorization.

11121201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99548.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11121201221 its reverse (12210212111), we get a palindrome (23331413332).

The spelling of 11121201221 in words is "eleven billion, one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".