20121120021 has 8 divisors (see below), whose sum is σ = 26846655264. Its totient is φ = 13404832400.

The previous prime is 20121120007. The next prime is 20121120077. The reversal of 20121120021 is 12002112102.

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

It is a cyclic number.

It is not a de Polignac number, because 20121120021 - 2¹⁴ = 20121103637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121119979 and 20121120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121120421) 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, 2306826 + ... + 2315531.

It is an arithmetic number, because the mean of its divisors is an integer number (3355831908).

Almost surely, 2^20121120021 is an apocalyptic number.

It is an amenable number.

20121120021 is a deficient number, since it is larger than the sum of its proper divisors (6725535243).

20121120021 is a wasteful number, since it uses less digits than its factorization.

20121120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623811.

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

Adding to 20121120021 its reverse (12002112102), we get a palindrome (32123232123).

The spelling of 20121120021 in words is "twenty billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".