20121121012021 has 16 divisors (see below), whose sum is σ = 20479813619328. Its totient is φ = 19765996488000.

The previous prime is 20121121011967. The next prime is 20121121012049. The reversal of 20121121012021 is 12021012112102.

It is a cyclic number.

It is not a de Polignac number, because 20121121012021 - 2²⁹ = 20120584141109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121121011986 and 20121121012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121121012621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8022526 + ... + 10227568.

It is an arithmetic number, because the mean of its divisors is an integer number (1279988351208).

Almost surely, 2^{20121121012021} is an apocalyptic number.

It is an amenable number.

20121121012021 is a deficient number, since it is larger than the sum of its proper divisors (358692607307).

20121121012021 is a wasteful number, since it uses less digits than its factorization.

20121121012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205852.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121121012021 its reverse (12021012112102), we get a palindrome (32142133124123).

The spelling of 20121121012021 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, twelve thousand, twenty-one".