12020120121 has 4 divisors (see below), whose sum is σ = 16026826832. Its totient is φ = 8013413412.

The previous prime is 12020120093. The next prime is 12020120149. The reversal of 12020120121 is 12102102021.

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 an interprime number because it is at equal distance from previous prime (12020120093) and next prime (12020120149).

It is not a de Polignac number, because 12020120121 - 2¹⁴ = 12020103737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020120097 and 12020120106.

It is not an unprimeable number, because it can be changed into a prime (12020120171) 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, 2003353351 + ... + 2003353356.

It is an arithmetic number, because the mean of its divisors is an integer number (4006706708).

Almost surely, 2^12020120121 is an apocalyptic number.

It is an amenable number.

12020120121 is a deficient number, since it is larger than the sum of its proper divisors (4006706711).

12020120121 is an equidigital number, since it uses as much as digits as its factorization.

12020120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006706710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12020120121 its reverse (12102102021), we get a palindrome (24122222142).

The spelling of 12020120121 in words is "twelve billion, twenty million, one hundred twenty thousand, one hundred twenty-one".