122208221 has 2 divisors, whose sum is σ = 122208222. Its totient is φ = 122208220.

The previous prime is 122208217. The next prime is 122208227. The reversal of 122208221 is 122802221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106296100 + 15912121 = 10310^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 122208221 - 2² = 122208217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122208193 and 122208202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122208227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61104110 + 61104111.

It is an arithmetic number, because the mean of its divisors is an integer number (61104111).

Almost surely, 2^122208221 is an apocalyptic number.

It is an amenable number.

122208221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122208221 is an equidigital number, since it uses as much as digits as its factorization.

122208221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 122208221 is about 11054.7827206146. The cubic root of 122208221 is about 496.2495668391.

The spelling of 122208221 in words is "one hundred twenty-two million, two hundred eight thousand, two hundred twenty-one".