12120121021 has 8 divisors (see below), whose sum is σ = 12187943424. Its totient is φ = 12052344480.

The previous prime is 12120120983. The next prime is 12120121121. The reversal of 12120121021 is 12012102121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12120121021 - 2²⁵ = 12086566589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120120992 and 12120121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120121121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612346 + ... + 631828.

It is an arithmetic number, because the mean of its divisors is an integer number (1523492928).

Almost surely, 2^12120121021 is an apocalyptic number.

It is an amenable number.

12120121021 is a deficient number, since it is larger than the sum of its proper divisors (67822403).

12120121021 is a wasteful number, since it uses less digits than its factorization.

12120121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22931.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12120121021 its reverse (12012102121), we get a palindrome (24132223142).

The spelling of 12120121021 in words is "twelve billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".