120121212021 has 4 divisors (see below), whose sum is σ = 160161616032. Its totient is φ = 80080808012.

The previous prime is 120121211981. The next prime is 120121212041. The reversal of 120121212021 is 120212121021.

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 120121212021 - 2⁶ = 120121211957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121212041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20020202001 + ... + 20020202006.

It is an arithmetic number, because the mean of its divisors is an integer number (40040404008).

Almost surely, 2^120121212021 is an apocalyptic number.

It is an amenable number.

120121212021 is a deficient number, since it is larger than the sum of its proper divisors (40040404011).

120121212021 is an equidigital number, since it uses as much as digits as its factorization.

120121212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40040404010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 120121212021 its reverse (120212121021), we get a palindrome (240333333042).

The spelling of 120121212021 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".