2001220211 has 2 divisors, whose sum is σ = 2001220212. Its totient is φ = 2001220210.

The previous prime is 2001220181. The next prime is 2001220261. The reversal of 2001220211 is 1120221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001220211 - 2¹⁸ = 2000958067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001220192 and 2001220201.

It is not a weakly prime, because it can be changed into another prime (2001220261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610105 + 1000610106.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610106).

Almost surely, 2^2001220211 is an apocalyptic number.

2001220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220211 is an equidigital number, since it uses as much as digits as its factorization.

2001220211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2001220211 is about 44734.9998435230. Note that the first 3 decimals coincide. The cubic root of 2001220211 is about 1260.1772260578.

Adding to 2001220211 its reverse (1120221002), we get a palindrome (3121441213).

The spelling of 2001220211 in words is "two billion, one million, two hundred twenty thousand, two hundred eleven".