122111121221 has 4 divisors (see below), whose sum is σ = 122222436012. Its totient is φ = 121999806432.

The previous prime is 122111121217. The next prime is 122111121311. The reversal of 122111121221 is 122121111221.

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 70803888100 + 51307233121 = 266090^2 + 226511^2 .

It is a cyclic number.

It is not a de Polignac number, because 122111121221 - 2² = 122111121217 is a prime.

It is a super-2 number, since 2×122111121221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122111121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122111121211) 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, 55655750 + ... + 55657943.

It is an arithmetic number, because the mean of its divisors is an integer number (30555609003).

Almost surely, 2^122111121221 is an apocalyptic number.

It is an amenable number.

122111121221 is a deficient number, since it is larger than the sum of its proper divisors (111314791).

122111121221 is a wasteful number, since it uses less digits than its factorization.

122111121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111314790.

The product of its digits is 32, while the sum is 17.

Adding to 122111121221 its reverse (122121111221), we get a palindrome (244232232442).

The spelling of 122111121221 in words is "one hundred twenty-two billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".