11222120021221 has 4 divisors (see below), whose sum is σ = 11222133959200. Its totient is φ = 11222106083244.

The previous prime is 11222120021213. The next prime is 11222120021237. The reversal of 11222120021221 is 12212002122211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11222120021221 - 2³ = 11222120021213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222120021821) 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, 5682051 + ... + 7397968.

It is an arithmetic number, because the mean of its divisors is an integer number (2805533489800).

Almost surely, 2^{11222120021221} is an apocalyptic number.

It is an amenable number.

11222120021221 is a deficient number, since it is larger than the sum of its proper divisors (13937979).

11222120021221 is an equidigital number, since it uses as much as digits as its factorization.

11222120021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13937978.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 11222120021221 its reverse (12212002122211), we get a palindrome (23434122143432).

The spelling of 11222120021221 in words is "eleven trillion, two hundred twenty-two billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".