120021112121 has 4 divisors (see below), whose sum is σ = 120021970512. Its totient is φ = 120020253732.

The previous prime is 120021112111. The next prime is 120021112147. The reversal of 120021112121 is 121211120021.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121211120021 = 41 ⋅2956368781.

It is a cyclic number.

It is not a de Polignac number, because 120021112121 - 2¹⁰ = 120021111097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021112096 and 120021112105.

It is not an unprimeable number, because it can be changed into a prime (120021112111) 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, 165431 + ... + 517116.

It is an arithmetic number, because the mean of its divisors is an integer number (30005492628).

Almost surely, 2^120021112121 is an apocalyptic number.

It is an amenable number.

120021112121 is a deficient number, since it is larger than the sum of its proper divisors (858391).

120021112121 is an equidigital number, since it uses as much as digits as its factorization.

120021112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858390.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 120021112121 its reverse (121211120021), we get a palindrome (241232232142).

The spelling of 120021112121 in words is "one hundred twenty billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".