11221121022221 has 16 divisors (see below), whose sum is σ = 12885793804800. Its totient is φ = 9663901383600.

The previous prime is 11221121022191. The next prime is 11221121022229. The reversal of 11221121022221 is 12222012112211.

It is a cyclic number.

It is not a de Polignac number, because 11221121022221 - 2²⁶ = 11221053913357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221121022193 and 11221121022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221121022229) 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, 8850890 + ... + 10038948.

It is an arithmetic number, because the mean of its divisors is an integer number (805362112800).

Almost surely, 2^{11221121022221} is an apocalyptic number.

11221121022221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221121022221 is a deficient number, since it is larger than the sum of its proper divisors (1664672782579).

11221121022221 is a wasteful number, since it uses less digits than its factorization.

11221121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233280.

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

Adding to 11221121022221 its reverse (12222012112211), we get a palindrome (23443133134432).

The spelling of 11221121022221 in words is "eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".