11221111112121 has 48 divisors (see below), whose sum is σ = 16870867558272. Its totient is φ = 7181688096000.

The previous prime is 11221111112051. The next prime is 11221111112179. The reversal of 11221111112121 is 12121111112211.

11221111112121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11221111112121 - 2¹⁷ = 11221110981049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11221111112094 and 11221111112103.

It is not an unprimeable number, because it can be changed into a prime (11221111112621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5151276 + ... + 6998418.

It is an arithmetic number, because the mean of its divisors is an integer number (351476407464).

Almost surely, 2^{11221111112121} is an apocalyptic number.

It is an amenable number.

11221111112121 is a deficient number, since it is larger than the sum of its proper divisors (5649756446151).

11221111112121 is a wasteful number, since it uses less digits than its factorization.

11221111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847454 (or 1847451 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11221111112121 its reverse (12121111112211), we get a palindrome (23342222224332).

The spelling of 11221111112121 in words is "eleven trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".