222221221201221 has 16 divisors (see below), whose sum is σ = 323340325815360. Its totient is φ = 134633920245120.

The previous prime is 222221221201219. The next prime is 222221221201261. The reversal of 222221221201221 is 122102122122222.

It is a happy number.

222221221201221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222221221201221 - 2¹ = 222221221201219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221221201191 and 222221221201200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221221201211) 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, 1140094966 + ... + 1140289863.

It is an arithmetic number, because the mean of its divisors is an integer number (20208770363460).

Almost surely, 2^{222221221201221} is an apocalyptic number.

It is an amenable number.

222221221201221 is a deficient number, since it is larger than the sum of its proper divisors (101119104614139).

222221221201221 is a wasteful number, since it uses less digits than its factorization.

222221221201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280387796.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 222221221201221 its reverse (122102122122222), we get a palindrome (344323343323443).

The spelling of 222221221201221 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".