22011 has 16 divisors (see below), whose sum is σ = 34560. Its totient is φ = 12320.

The previous prime is 22003. The next prime is 22013. The reversal of 22011 is 11022.

It is a happy number.

22011 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 22011 - 2³ = 22003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (2160).

2²²⁰¹¹ is an apocalyptic number.

22011 is a deficient number, since it is larger than the sum of its proper divisors (12549).

22011 is a wasteful number, since it uses less digits than its factorization.

22011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 22011 is about 148.3610461004. The cubic root of 22011 is about 28.0250625940.

Adding to 22011 its reverse (11022), we get a palindrome (33033).

It can be divided in two parts, 220 and 11, that added together give a triangular number (231 = T₂₁).

The spelling of 22011 in words is "twenty-two thousand, eleven", and thus it is an iban number.