22221012222221 has 4 divisors (see below), whose sum is σ = 23528130588252. Its totient is φ = 20913893856192.

The previous prime is 22221012222217. The next prime is 22221012222251. The reversal of 22221012222221 is 12222221012222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7767290964196 + 14453721258025 = 2786986^2 + 3801805^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221012222221 - 2² = 22221012222217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221012222251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653559182990 + ... + 653559183023.

It is an arithmetic number, because the mean of its divisors is an integer number (5882032647063).

Almost surely, 2^{22221012222221} is an apocalyptic number.

It is an amenable number.

22221012222221 is a deficient number, since it is larger than the sum of its proper divisors (1307118366031).

22221012222221 is a wasteful number, since it uses less digits than its factorization.

22221012222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307118366030.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 22221012222221 its reverse (12222221012222), we get a palindrome (34443233234443).

The spelling of 22221012222221 in words is "twenty-two trillion, two hundred twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".