212221222009 has 2 divisors, whose sum is σ = 212221222010. Its totient is φ = 212221222008.

The previous prime is 212221222007. The next prime is 212221222027. The reversal of 212221222009 is 900222122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196606220409 + 15615001600 = 443403^2 + 124960^2 .

It is a cyclic number.

It is not a de Polignac number, because 212221222009 - 2¹ = 212221222007 is a prime.

Together with 212221222007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212221222007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110611004 + 106110611005.

It is an arithmetic number, because the mean of its divisors is an integer number (106110611005).

Almost surely, 2^212221222009 is an apocalyptic number.

It is an amenable number.

212221222009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221222009 is an equidigital number, since it uses as much as digits as its factorization.

212221222009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 212221222009 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, nine".