122120212221 has 30 divisors (see below), whose sum is σ = 212210413470. Its totient is φ = 69782976144.

The previous prime is 122120212157. The next prime is 122120212241. The reversal of 122120212221 is 122212021221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 104248265625 + 17871946596 = 322875^2 + 133686^2 .

It is not a de Polignac number, because 122120212221 - 2⁶ = 122120212157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122120212194 and 122120212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122120212241) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 15380286 + ... + 15388223.

It is an arithmetic number, because the mean of its divisors is an integer number (7073680449).

Almost surely, 2^122120212221 is an apocalyptic number.

It is an amenable number.

122120212221 is a deficient number, since it is larger than the sum of its proper divisors (90090201249).

122120212221 is an equidigital number, since it uses as much as digits as its factorization.

122120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30768535 (or 30768519 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 122120212221 its reverse (122212021221), we get a palindrome (244332233442).

The spelling of 122120212221 in words is "one hundred twenty-two billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".