222221101212221 has 16 divisors (see below), whose sum is σ = 232690594752000. Its totient is φ = 211819861593648.

The previous prime is 222221101212211. The next prime is 222221101212239. The reversal of 222221101212221 is 122212101122222.

222221101212221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 222221101212221 - 2⁴² = 217823054701117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221101212211) 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, 391271 + ... + 21085428.

It is an arithmetic number, because the mean of its divisors is an integer number (14543162172000).

Almost surely, 2^{222221101212221} is an apocalyptic number.

It is an amenable number.

222221101212221 is a deficient number, since it is larger than the sum of its proper divisors (10469493539779).

222221101212221 is a wasteful number, since it uses less digits than its factorization.

222221101212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21478288.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222221101212221 its reverse (122212101122222), we get a palindrome (344433202334443).

The spelling of 222221101212221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred twenty-one".