820122111022121 has 8 divisors (see below), whose sum is σ = 835658069514624. Its totient is φ = 804588447211120.

The previous prime is 820122111022111. The next prime is 820122111022141. The reversal of 820122111022121 is 121220111221028.

It is a happy number.

820122111022121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820122111022121 - 2²⁶ = 820122043913257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820122111022111) 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, 572948795 + ... + 574378416.

It is an arithmetic number, because the mean of its divisors is an integer number (104457258689328).

Almost surely, 2^{820122111022121} is an apocalyptic number.

It is an amenable number.

820122111022121 is a deficient number, since it is larger than the sum of its proper divisors (15535958492503).

820122111022121 is a wasteful number, since it uses less digits than its factorization.

820122111022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147340751.

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 820122111022121 its reverse (121220111221028), we get a palindrome (941342222243149).

The spelling of 820122111022121 in words is "eight hundred twenty trillion, one hundred twenty-two billion, one hundred eleven million, twenty-two thousand, one hundred twenty-one".