2021100212121 has 8 divisors (see below), whose sum is σ = 2694866834304. Its totient is φ = 1347366865680.

The previous prime is 2021100212071. The next prime is 2021100212137. The reversal of 2021100212121 is 1212120011202.

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

It is not a de Polignac number, because 2021100212121 - 2²⁷ = 2020965994393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021100212121.

It is not an unprimeable number, because it can be changed into a prime (2021100212161) 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, 8176866 + ... + 8420411.

It is an arithmetic number, because the mean of its divisors is an integer number (336858354288).

Almost surely, 2^{2021100212121} is an apocalyptic number.

It is an amenable number.

2021100212121 is a deficient number, since it is larger than the sum of its proper divisors (673766622183).

2021100212121 is a wasteful number, since it uses less digits than its factorization.

2021100212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16637871.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021100212121 its reverse (1212120011202), we get a palindrome (3233220223323).

The spelling of 2021100212121 in words is "two trillion, twenty-one billion, one hundred million, two hundred twelve thousand, one hundred twenty-one".