122212421 has 2 divisors, whose sum is σ = 122212422. Its totient is φ = 122212420.

The previous prime is 122212417. The next prime is 122212451. The reversal of 122212421 is 124212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 57988225 = 8014^2 + 7615^2 .

It is a cyclic number.

It is not a de Polignac number, because 122212421 - 2² = 122212417 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122212421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122212451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61106210 + 61106211.

It is an arithmetic number, because the mean of its divisors is an integer number (61106211).

Almost surely, 2^122212421 is an apocalyptic number.

It is an amenable number.

122212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122212421 is an equidigital number, since it uses as much as digits as its factorization.

122212421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128, while the sum is 17.

The square root of 122212421 is about 11054.9726820106. The cubic root of 122212421 is about 496.2552517384.

Adding to 122212421 its reverse (124212221), we get a palindrome (246424642).

The spelling of 122212421 in words is "one hundred twenty-two million, two hundred twelve thousand, four hundred twenty-one".