2011021211 has 4 divisors (see below), whose sum is σ = 2080366800. Its totient is φ = 1941675624.

The previous prime is 2011021189. The next prime is 2011021213. The reversal of 2011021211 is 1121201102.

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 2011021211 - 2¹⁸ = 2010759067 is a prime.

It is a super-2 number, since 2×2011021211² = 8088412622183813042, 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 = 2011021192 and 2011021201.

It is not an unprimeable number, because it can be changed into a prime (2011021213) 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, 34672751 + ... + 34672808.

It is an arithmetic number, because the mean of its divisors is an integer number (520091700).

Almost surely, 2^2011021211 is an apocalyptic number.

2011021211 is a deficient number, since it is larger than the sum of its proper divisors (69345589).

2011021211 is an equidigital number, since it uses as much as digits as its factorization.

2011021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69345588.

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

The square root of 2011021211 is about 44844.4111456489. The cubic root of 2011021211 is about 1262.2311210689.

Adding to 2011021211 its reverse (1121201102), we get a palindrome (3132222313).

The spelling of 2011021211 in words is "two billion, eleven million, twenty-one thousand, two hundred eleven".