2021002002121 has 16 divisors (see below), whose sum is σ = 2200742683776. Its totient is φ = 1848164795136.

The previous prime is 2021002002079. The next prime is 2021002002127. The reversal of 2021002002121 is 1212002001202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021002002121 - 2³³ = 2012412067529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021002002127) 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 15 ways as a sum of consecutive naturals, for example, 1752511 + ... + 2667076.

It is an arithmetic number, because the mean of its divisors is an integer number (137546417736).

Almost surely, 2^{2021002002121} is an apocalyptic number.

It is an amenable number.

2021002002121 is a deficient number, since it is larger than the sum of its proper divisors (179740681655).

2021002002121 is a wasteful number, since it uses less digits than its factorization.

2021002002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420368.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021002002121 its reverse (1212002001202), we get a palindrome (3233004003323).

The spelling of 2021002002121 in words is "two trillion, twenty-one billion, two million, two thousand, one hundred twenty-one".