11021223121 has 4 divisors (see below), whose sum is σ = 11130344244. Its totient is φ = 10912102000.

The previous prime is 11021223071. The next prime is 11021223127. The reversal of 11021223121 is 12132212011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12132212011 = 101 ⋅120120911.

It can be written as a sum of positive squares in 2 ways, for example, as 10335568896 + 685654225 = 101664^2 + 26185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021223121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021223095 and 11021223104.

It is not an unprimeable number, because it can be changed into a prime (11021223127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54560410 + ... + 54560611.

It is an arithmetic number, because the mean of its divisors is an integer number (2782586061).

Almost surely, 2^11021223121 is an apocalyptic number.

It is an amenable number.

11021223121 is a deficient number, since it is larger than the sum of its proper divisors (109121123).

11021223121 is a wasteful number, since it uses less digits than its factorization.

11021223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109121122.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11021223121 its reverse (12132212011), we get a palindrome (23153435132).

The spelling of 11021223121 in words is "eleven billion, twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".