122121213221 has 4 divisors (see below), whose sum is σ = 139567100832. Its totient is φ = 104675325612.

The previous prime is 122121213217. The next prime is 122121213233. The reversal of 122121213221 is 122312121221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122312121221 = 79 ⋅1548254699.

It is a cyclic number.

It is not a de Polignac number, because 122121213221 - 2² = 122121213217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 122121213193 and 122121213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122121213281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8722943795 + ... + 8722943808.

It is an arithmetic number, because the mean of its divisors is an integer number (34891775208).

Almost surely, 2^122121213221 is an apocalyptic number.

It is an amenable number.

122121213221 is a deficient number, since it is larger than the sum of its proper divisors (17445887611).

122121213221 is an equidigital number, since it uses as much as digits as its factorization.

122121213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17445887610.

The product of its digits is 192, while the sum is 20.

Adding to 122121213221 its reverse (122312121221), we get a palindrome (244433334442).

The spelling of 122121213221 in words is "one hundred twenty-two billion, one hundred twenty-one million, two hundred thirteen thousand, two hundred twenty-one".