2222122222221 has 64 divisors (see below), whose sum is σ = 3345689394432. Its totient is φ = 1300147200000.

The previous prime is 2222122222153. The next prime is 2222122222259. The reversal of 2222122222221 is 1222222212222.

It is not a de Polignac number, because 2222122222221 - 2³⁸ = 1947244315277 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2222122222191 and 2222122222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222122222421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 324820761 + ... + 324827601.

It is an arithmetic number, because the mean of its divisors is an integer number (52276396788).

Almost surely, 2^{2222122222221} is an apocalyptic number.

It is an amenable number.

2222122222221 is a deficient number, since it is larger than the sum of its proper divisors (1123567172211).

2222122222221 is a wasteful number, since it uses less digits than its factorization.

2222122222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9374.

The product of its digits is 2048, while the sum is 24.

Adding to 2222122222221 its reverse (1222222212222), we get a palindrome (3444344434443).

Subtracting from 2222122222221 its reverse (1222222212222), we obtain a palindrome (999900009999).

The spelling of 2222122222221 in words is "two trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".