2121001211 has 16 divisors (see below), whose sum is σ = 2483198400. Its totient is φ = 1810851840.

The previous prime is 2121001193. The next prime is 2121001213. The reversal of 2121001211 is 1121001212.

It is a de Polignac number, because none of the positive numbers 2^k-2121001211 is a prime.

It is a super-2 number, since 2×2121001211² = 8997292274126933042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121001192 and 2121001201.

It is not an unprimeable number, because it can be changed into a prime (2121001213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76121 + ... + 100181.

It is an arithmetic number, because the mean of its divisors is an integer number (155199900).

Almost surely, 2^2121001211 is an apocalyptic number.

2121001211 is a deficient number, since it is larger than the sum of its proper divisors (362197189).

2121001211 is an equidigital number, since it uses as much as digits as its factorization.

2121001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24339 (or 24325 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2121001211 is about 46054.3289061951. The cubic root of 2121001211 is about 1284.8338565999.

Adding to 2121001211 its reverse (1121001212), we get a palindrome (3242002423).

Subtracting from 2121001211 its reverse (1121001212), we obtain a palindrome (999999999).

It can be divided in two parts, 2121001 and 211, that added together give a palindrome (2121212).

The spelling of 2121001211 in words is "two billion, one hundred twenty-one million, one thousand, two hundred eleven".