121220200021121 has 4 divisors (see below), whose sum is σ = 121754209713072. Its totient is φ = 120686190329172.

The previous prime is 121220200021093. The next prime is 121220200021139. The reversal of 121220200021121 is 121120002022121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121220200021121 - 2¹⁴ = 121220200004737 is a prime.

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 121220200021121.

It is not an unprimeable number, because it can be changed into a prime (121220205021121) 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, 267004845635 + ... + 267004846088.

It is an arithmetic number, because the mean of its divisors is an integer number (30438552428268).

Almost surely, 2^{121220200021121} is an apocalyptic number.

It is an amenable number.

121220200021121 is a deficient number, since it is larger than the sum of its proper divisors (534009691951).

121220200021121 is an equidigital number, since it uses as much as digits as its factorization.

121220200021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534009691950.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121220200021121 its reverse (121120002022121), we get a palindrome (242340202043242).

The spelling of 121220200021121 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred million, twenty-one thousand, one hundred twenty-one".