2021121211 has 6 divisors (see below), whose sum is σ = 2147004500. Its totient is φ = 1902231456.

The previous prime is 2021121209. The next prime is 2021121233. The reversal of 2021121211 is 1121211202.

It is not a de Polignac number, because 2021121211 - 2¹ = 2021121209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021121191 and 2021121200.

It is not an unprimeable number, because it can be changed into a prime (2021121611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3496461 + ... + 3497038.

Almost surely, 2^2021121211 is an apocalyptic number.

2021121211 is a deficient number, since it is larger than the sum of its proper divisors (125883289).

2021121211 is an equidigital number, since it uses as much as digits as its factorization.

2021121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6993533 (or 6993516 counting only the distinct ones).

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

The square root of 2021121211 is about 44956.8816867896. The cubic root of 2021121211 is about 1264.3407045284.

Adding to 2021121211 its reverse (1121211202), we get a palindrome (3142332413).

It can be divided in two parts, 202 and 1121211, that multiplied together give a palindrome (226484622).

The spelling of 2021121211 in words is "two billion, twenty-one million, one hundred twenty-one thousand, two hundred eleven".