11132121221 has 32 divisors (see below), whose sum is σ = 12856112640. Its totient is φ = 9564420096.

The previous prime is 11132121199. The next prime is 11132121229. The reversal of 11132121221 is 12212123111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11132121221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11132121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11132121229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1182485 + ... + 1191861.

It is an arithmetic number, because the mean of its divisors is an integer number (401753520).

Almost surely, 2^11132121221 is an apocalyptic number.

It is an amenable number.

11132121221 is a deficient number, since it is larger than the sum of its proper divisors (1723991419).

11132121221 is a wasteful number, since it uses less digits than its factorization.

11132121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9533.

The product of its digits is 48, while the sum is 17.

Adding to 11132121221 its reverse (12212123111), we get a palindrome (23344244332).

The spelling of 11132121221 in words is "eleven billion, one hundred thirty-two million, one hundred twenty-one thousand, two hundred twenty-one".