221222102220221 has 16 divisors (see below), whose sum is σ = 224058115332480. Its totient is φ = 218404185796800.

The previous prime is 221222102220139. The next prime is 221222102220247. The reversal of 221222102220221 is 122022201222122.

It is a cyclic number.

It is not a de Polignac number, because 221222102220221 - 2¹⁰ = 221222102219197 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 (221222102220521) 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, 1988404031 + ... + 1988515283.

It is an arithmetic number, because the mean of its divisors is an integer number (14003632208280).

Almost surely, 2^{221222102220221} is an apocalyptic number.

It is an amenable number.

221222102220221 is a deficient number, since it is larger than the sum of its proper divisors (2836013112259).

221222102220221 is a wasteful number, since it uses less digits than its factorization.

221222102220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192356.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221222102220221 its reverse (122022201222122), we get a palindrome (343244303442343).

The spelling of 221222102220221 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred two million, two hundred twenty thousand, two hundred twenty-one".