221022111221221 has 4 divisors (see below), whose sum is σ = 221472258087744. Its totient is φ = 220571964354700.

The previous prime is 221022111221209. The next prime is 221022111221227. The reversal of 221022111221221 is 122122111220122.

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 221022111221221 - 2⁹ = 221022111220709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221022111221192 and 221022111221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022111221227) 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, 225073432525 + ... + 225073433506.

It is an arithmetic number, because the mean of its divisors is an integer number (55368064521936).

Almost surely, 2^{221022111221221} is an apocalyptic number.

It is an amenable number.

221022111221221 is a deficient number, since it is larger than the sum of its proper divisors (450146866523).

221022111221221 is an equidigital number, since it uses as much as digits as its factorization.

221022111221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450146866522.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221022111221221 its reverse (122122111220122), we get a palindrome (343144222441343).

The spelling of 221022111221221 in words is "two hundred twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".