12222202121221 has 16 divisors (see below), whose sum is σ = 13046066302464. Its totient is φ = 11423516266624.

The previous prime is 12222202121191. The next prime is 12222202121249. The reversal of 12222202121221 is 12212120222221.

It is not a de Polignac number, because 12222202121221 - 2¹¹ = 12222202119173 is a prime.

It is a super-2 number, since 2×12222202121221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222202121192 and 12222202121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222202121281) 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, 8495410 + ... + 9829363.

It is an arithmetic number, because the mean of its divisors is an integer number (815379143904).

Almost surely, 2^{12222202121221} is an apocalyptic number.

It is an amenable number.

12222202121221 is a deficient number, since it is larger than the sum of its proper divisors (823864181243).

12222202121221 is a wasteful number, since it uses less digits than its factorization.

12222202121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18325460.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12222202121221 its reverse (12212120222221), we get a palindrome (24434322343442).

The spelling of 12222202121221 in words is "twelve trillion, two hundred twenty-two billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".