221200000221 has 4 divisors (see below), whose sum is σ = 294933333632. Its totient is φ = 147466666812.

The previous prime is 221200000183. The next prime is 221200000267. The reversal of 221200000221 is 122000002122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-221200000221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221200000197 and 221200000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200000321) 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, 36866666701 + ... + 36866666706.

It is an arithmetic number, because the mean of its divisors is an integer number (73733333408).

Almost surely, 2^221200000221 is an apocalyptic number.

It is an amenable number.

221200000221 is a deficient number, since it is larger than the sum of its proper divisors (73733333411).

221200000221 is an equidigital number, since it uses as much as digits as its factorization.

221200000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73733333410.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221200000221 its reverse (122000002122), we get a palindrome (343200002343).

The spelling of 221200000221 in words is "two hundred twenty-one billion, two hundred million, two hundred twenty-one", and thus it is an aban number.