2021211211121 has 4 divisors (see below), whose sum is σ = 2040101035632. Its totient is φ = 2002321386612.

The previous prime is 2021211211093. The next prime is 2021211211169. The reversal of 2021211211121 is 1211121121202.

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 not a de Polignac number, because 2021211211121 - 2³⁴ = 2004031341937 is a prime.

It is a super-2 number, since 2×2021211211121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021211211121.

It is not an unprimeable number, because it can be changed into a prime (2021211211421) 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, 9444912095 + ... + 9444912308.

It is an arithmetic number, because the mean of its divisors is an integer number (510025258908).

Almost surely, 2^{2021211211121} is an apocalyptic number.

It is an amenable number.

2021211211121 is a deficient number, since it is larger than the sum of its proper divisors (18889824511).

2021211211121 is a wasteful number, since it uses less digits than its factorization.

2021211211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18889824510.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2021211211121 its reverse (1211121121202), we get a palindrome (3232332332323).

The spelling of 2021211211121 in words is "two trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".