12120121001021 has 4 divisors (see below), whose sum is σ = 13221950182944. Its totient is φ = 11018291819100.

The previous prime is 12120121001011. The next prime is 12120121001047. The reversal of 12120121001021 is 12010012102121.

12120121001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-12120121001021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120121000987 and 12120121001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120121001011) 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, 550914590945 + ... + 550914590966.

It is an arithmetic number, because the mean of its divisors is an integer number (3305487545736).

Almost surely, 2^{12120121001021} is an apocalyptic number.

12120121001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12120121001021 is a deficient number, since it is larger than the sum of its proper divisors (1101829181923).

12120121001021 is a wasteful number, since it uses less digits than its factorization.

12120121001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101829181922.

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

Adding to 12120121001021 its reverse (12010012102121), we get a palindrome (24130133103142).

The spelling of 12120121001021 in words is "twelve trillion, one hundred twenty billion, one hundred twenty-one million, one thousand, twenty-one".