11121222120221 has 4 divisors (see below), whose sum is σ = 11122145591712. Its totient is φ = 11120298648732.

The previous prime is 11121222120187. The next prime is 11121222120251. The reversal of 11121222120221 is 12202122212111.

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 11121222120221 - 2⁶ = 11121222120157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121222120193 and 11121222120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121222120251) 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, 461717681 + ... + 461741766.

It is an arithmetic number, because the mean of its divisors is an integer number (2780536397928).

Almost surely, 2^{11121222120221} is an apocalyptic number.

It is an amenable number.

11121222120221 is a deficient number, since it is larger than the sum of its proper divisors (923471491).

11121222120221 is an equidigital number, since it uses as much as digits as its factorization.

11121222120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923471490.

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

Adding to 11121222120221 its reverse (12202122212111), we get a palindrome (23323344332332).

The spelling of 11121222120221 in words is "eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-one".