122120212100221 has 4 divisors (see below), whose sum is σ = 122120236893244. Its totient is φ = 122120187307200.

The previous prime is 122120212100179. The next prime is 122120212100239. The reversal of 122120212100221 is 122001212021221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34360582004100 + 87759630096121 = 5861790^2 + 9368011^2 .

It is a cyclic number.

It is not a de Polignac number, because 122120212100221 - 2⁷ = 122120212100093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122120212100291) 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, 2227590 + ... + 15786151.

It is an arithmetic number, because the mean of its divisors is an integer number (30530059223311).

Almost surely, 2^{122120212100221} is an apocalyptic number.

It is an amenable number.

122120212100221 is a deficient number, since it is larger than the sum of its proper divisors (24793023).

122120212100221 is an equidigital number, since it uses as much as digits as its factorization.

122120212100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24793022.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 122120212100221 its reverse (122001212021221), we get a palindrome (244121424121442).

The spelling of 122120212100221 in words is "one hundred twenty-two trillion, one hundred twenty billion, two hundred twelve million, one hundred thousand, two hundred twenty-one".