2121201211 has 4 divisors (see below), whose sum is σ = 2232843400. Its totient is φ = 2009559024.

The previous prime is 2121201209. The next prime is 2121201233. The reversal of 2121201211 is 1121021212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121201211 - 2¹ = 2121201209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121201191 and 2121201200.

It is not an unprimeable number, because it can be changed into a prime (2121201311) 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, 55821066 + ... + 55821103.

It is an arithmetic number, because the mean of its divisors is an integer number (558210850).

Almost surely, 2^2121201211 is an apocalyptic number.

2121201211 is a deficient number, since it is larger than the sum of its proper divisors (111642189).

2121201211 is a wasteful number, since it uses less digits than its factorization.

2121201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111642188.

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

The square root of 2121201211 is about 46056.5002035543. The cubic root of 2121201211 is about 1284.8742398387.

Adding to 2121201211 its reverse (1121021212), we get a palindrome (3242222423).

The spelling of 2121201211 in words is "two billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".