221222120110221 has 4 divisors (see below), whose sum is σ = 294962826813632. Its totient is φ = 147481413406812.

The previous prime is 221222120110219. The next prime is 221222120110267. The reversal of 221222120110221 is 122011021222122.

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 not a de Polignac number, because 221222120110221 - 2¹ = 221222120110219 is a prime.

It is a super-2 number, since 2×221222120110221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222120112221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36870353351701 + ... + 36870353351706.

It is an arithmetic number, because the mean of its divisors is an integer number (73740706703408).

Almost surely, 2^{221222120110221} is an apocalyptic number.

It is an amenable number.

221222120110221 is a deficient number, since it is larger than the sum of its proper divisors (73740706703411).

221222120110221 is an equidigital number, since it uses as much as digits as its factorization.

221222120110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73740706703410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221222120110221 its reverse (122011021222122), we get a palindrome (343233141332343).

The spelling of 221222120110221 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one hundred ten thousand, two hundred twenty-one".