22222121212221 has 32 divisors (see below), whose sum is σ = 35644847477760. Its totient is φ = 12029904988416.

The previous prime is 22222121212129. The next prime is 22222121212271. The reversal of 22222121212221 is 12221212122222.

It is a happy number.

It is not a de Polignac number, because 22222121212221 - 2¹⁸ = 22222120950077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222121212191 and 22222121212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222121212271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56328565 + ... + 56721701.

It is an arithmetic number, because the mean of its divisors is an integer number (1113901483680).

Almost surely, 2^{22222121212221} is an apocalyptic number.

22222121212221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22222121212221 is a deficient number, since it is larger than the sum of its proper divisors (13422726265539).

22222121212221 is a wasteful number, since it uses less digits than its factorization.

22222121212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534833.

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

Adding to 22222121212221 its reverse (12221212122222), we get a palindrome (34443333334443).

The spelling of 22222121212221 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".