121122112221221 has 8 divisors (see below), whose sum is σ = 126390284816640. Its totient is φ = 115854105776112.

The previous prime is 121122112221163. The next prime is 121122112221233. The reversal of 121122112221221 is 122122211221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121122112221221 - 2³⁴ = 121104932352037 is a prime.

It is a super-3 number, since 3×121122112221221³ (a number of 43 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122112221241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40046750 + ... + 42964943.

It is an arithmetic number, because the mean of its divisors is an integer number (15798785602080).

Almost surely, 2^{121122112221221} is an apocalyptic number.

It is an amenable number.

121122112221221 is a deficient number, since it is larger than the sum of its proper divisors (5268172595419).

121122112221221 is an equidigital number, since it uses as much as digits as its factorization.

121122112221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83075155.

The product of its digits is 256, while the sum is 23.

Adding to 121122112221221 its reverse (122122211221121), we get a palindrome (243244323442342).

It can be divided in two parts, 1211221 and 12221221, that multiplied together give a palindrome (14802599520841).

The spelling of 121122112221221 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".