11221221022121 has 8 divisors (see below), whose sum is σ = 12241402992000. Its totient is φ = 10201050880240.

The previous prime is 11221221022021. The next prime is 11221221022129. The reversal of 11221221022121 is 12122012212211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11221221022121 - 2²⁶ = 11221153913257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221221022093 and 11221221022102.

It is not an unprimeable number, because it can be changed into a prime (11221221022129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911846 + ... + 4824303.

It is an arithmetic number, because the mean of its divisors is an integer number (1530175374000).

Almost surely, 2^{11221221022121} is an apocalyptic number.

11221221022121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221221022121 is a deficient number, since it is larger than the sum of its proper divisors (1020181969879).

11221221022121 is a wasteful number, since it uses less digits than its factorization.

11221221022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913999.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11221221022121 its reverse (12122012212211), we get a palindrome (23343233234332).

The spelling of 11221221022121 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred twenty-one".