2021212121211 has 32 divisors (see below), whose sum is σ = 3029639110400. Its totient is φ = 1331652130560.

The previous prime is 2021212121209. The next prime is 2021212121219. The reversal of 2021212121211 is 1121212121202.

It is not a de Polignac number, because 2021212121211 - 2¹ = 2021212121209 is a prime.

It is a super-2 number, since 2×2021212121211² (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 (2021212121219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1251300 + ... + 2368158.

It is an arithmetic number, because the mean of its divisors is an integer number (94676222200).

Almost surely, 2^{2021212121211} is an apocalyptic number.

2021212121211 is a deficient number, since it is larger than the sum of its proper divisors (1008426989189).

2021212121211 is a wasteful number, since it uses less digits than its factorization.

2021212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117656 (or 1117650 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2021212121211 its reverse (1121212121202), we get a palindrome (3142424242413).

Subtracting from 2021212121211 its reverse (1121212121202), we obtain a palindrome (900000000009).

The spelling of 2021212121211 in words is "two trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".