11222221112121 has 16 divisors (see below), whose sum is σ = 15187522498560. Its totient is φ = 7369639689360.

The previous prime is 11222221112107. The next prime is 11222221112143. The reversal of 11222221112121 is 12121112222211.

It is not a de Polignac number, because 11222221112121 - 2¹⁴ = 11222221095737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11222221122121) 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 15 ways as a sum of consecutive naturals, for example, 54829575 + ... + 55033868.

It is an arithmetic number, because the mean of its divisors is an integer number (949220156160).

Almost surely, 2^{11222221112121} is an apocalyptic number.

It is an amenable number.

11222221112121 is a deficient number, since it is larger than the sum of its proper divisors (3965301386439).

11222221112121 is a wasteful number, since it uses less digits than its factorization.

11222221112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109863956.

The product of its digits is 128, while the sum is 21.

Adding to 11222221112121 its reverse (12121112222211), we get a palindrome (23343333334332).

The spelling of 11222221112121 in words is "eleven trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".