22222122221221 has 32 divisors (see below), whose sum is σ = 24269736411648. Its totient is φ = 20225234165760.

The previous prime is 22222122221219. The next prime is 22222122221279. The reversal of 22222122221221 is 12212222122222.

It is not a de Polignac number, because 22222122221221 - 2¹ = 22222122221219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222122221281) 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, 213197700 + ... + 213301906.

It is an arithmetic number, because the mean of its divisors is an integer number (758429262864).

Almost surely, 2^{22222122221221} is an apocalyptic number.

It is an amenable number.

22222122221221 is a deficient number, since it is larger than the sum of its proper divisors (2047614190427).

22222122221221 is a wasteful number, since it uses less digits than its factorization.

22222122221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105181.

The product of its digits is 2048, while the sum is 25.

Adding to 22222122221221 its reverse (12212222122222), we get a palindrome (34434344343443).

The spelling of 22222122221221 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".