2211881 has 8 divisors (see below), whose sum is σ = 2609664. Its totient is φ = 1834560.

The previous prime is 2211821. The next prime is 2211883. The reversal of 2211881 is 1881122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2211881 - 2⁶ = 2211817 is a prime.

It is a super-2 number, since 2×2211881² = 9784835116322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4880 + ... + 5313.

It is an arithmetic number, because the mean of its divisors is an integer number (326208).

2^2211881 is an apocalyptic number.

It is an amenable number.

2211881 is a deficient number, since it is larger than the sum of its proper divisors (397783).

2211881 is a wasteful number, since it uses less digits than its factorization.

2211881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10231.

The product of its digits is 256, while the sum is 23.

The square root of 2211881 is about 1487.2393889351. The cubic root of 2211881 is about 130.2928506489.

The spelling of 2211881 in words is "two million, two hundred eleven thousand, eight hundred eighty-one".