22200000221221 has 4 divisors (see below), whose sum is σ = 22202798666092. Its totient is φ = 22197201776352.

The previous prime is 22200000221171. The next prime is 22200000221249. The reversal of 22200000221221 is 12212200000222.

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 3910264998721 + 18289735222500 = 1977439^2 + 4276650^2 .

It is a cyclic number.

It is not a de Polignac number, because 22200000221221 - 2⁹ = 22200000220709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22200000221195 and 22200000221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22200000227221) 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, 1399210536 + ... + 1399226401.

It is an arithmetic number, because the mean of its divisors is an integer number (5550699666523).

Almost surely, 2^{22200000221221} is an apocalyptic number.

It is an amenable number.

22200000221221 is a deficient number, since it is larger than the sum of its proper divisors (2798444871).

22200000221221 is an equidigital number, since it uses as much as digits as its factorization.

22200000221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798444870.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22200000221221 its reverse (12212200000222), we get a palindrome (34412200221443).

The spelling of 22200000221221 in words is "twenty-two trillion, two hundred billion, two hundred twenty-one thousand, two hundred twenty-one".