11220121121 has 16 divisors (see below), whose sum is σ = 12671520768. Its totient is φ = 9842523600.

The previous prime is 11220121117. The next prime is 11220121123. The reversal of 11220121121 is 12112102211.

It is a cyclic number.

It is not a de Polignac number, because 11220121121 - 2² = 11220121117 is a prime.

It is a super-2 number, since 2×11220121121² (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 = 11220121096 and 11220121105.

It is not an unprimeable number, because it can be changed into a prime (11220121123) 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, 70916 + ... + 165738.

It is an arithmetic number, because the mean of its divisors is an integer number (791970048).

Almost surely, 2^11220121121 is an apocalyptic number.

11220121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11220121121 is a deficient number, since it is larger than the sum of its proper divisors (1451399647).

11220121121 is a wasteful number, since it uses less digits than its factorization.

11220121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95212.

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

Adding to 11220121121 its reverse (12112102211), we get a palindrome (23332223332).

The spelling of 11220121121 in words is "eleven billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".