120212121 has 4 divisors (see below), whose sum is σ = 160282832. Its totient is φ = 80141412.

The previous prime is 120212089. The next prime is 120212129. The reversal of 120212121 is 121212021.

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 not a de Polignac number, because 120212121 - 2⁵ = 120212089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120212097 and 120212106.

It is not an unprimeable number, because it can be changed into a prime (120212129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20035351 + ... + 20035356.

It is an arithmetic number, because the mean of its divisors is an integer number (40070708).

Almost surely, 2^120212121 is an apocalyptic number.

It is an amenable number.

120212121 is a deficient number, since it is larger than the sum of its proper divisors (40070711).

120212121 is an equidigital number, since it uses as much as digits as its factorization.

120212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40070710.

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

The square root of 120212121 is about 10964.1288299618. The cubic root of 120212121 is about 493.5328745491.

Adding to 120212121 its reverse (121212021), we get a palindrome (241424142).

The spelling of 120212121 in words is "one hundred twenty million, two hundred twelve thousand, one hundred twenty-one".