2021000211121 has 4 divisors (see below), whose sum is σ = 2023614701172. Its totient is φ = 2018385721072.

The previous prime is 2021000211091. The next prime is 2021000211143. The reversal of 2021000211121 is 1211120001202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 337003470400 + 1683996740721 = 580520^2 + 1297689^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021000211121 - 2¹³ = 2021000202929 is a prime.

It is a super-2 number, since 2×2021000211121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021000281121) 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, 1307243866 + ... + 1307245411.

It is an arithmetic number, because the mean of its divisors is an integer number (505903675293).

Almost surely, 2^{2021000211121} is an apocalyptic number.

It is an amenable number.

2021000211121 is a deficient number, since it is larger than the sum of its proper divisors (2614490051).

2021000211121 is an equidigital number, since it uses as much as digits as its factorization.

2021000211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614490050.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2021000211121 its reverse (1211120001202), we get a palindrome (3232120212323).

The spelling of 2021000211121 in words is "two trillion, twenty-one billion, two hundred eleven thousand, one hundred twenty-one".