12211881 has 8 divisors (see below), whose sum is σ = 17762784. Its totient is φ = 7401120.

The previous prime is 12211867. The next prime is 12211907. The reversal of 12211881 is 18811221.

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

It is not a de Polignac number, because 12211881 - 2⁶ = 12211817 is a prime.

It is a super-2 number, since 2×12211881² = 298260075116322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12211841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184996 + ... + 185061.

It is an arithmetic number, because the mean of its divisors is an integer number (2220348).

Almost surely, 2^12211881 is an apocalyptic number.

12211881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211881 is a deficient number, since it is larger than the sum of its proper divisors (5550903).

12211881 is a wasteful number, since it uses less digits than its factorization.

12211881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370071.

The product of its digits is 256, while the sum is 24.

The square root of 12211881 is about 3494.5501856462. The cubic root of 12211881 is about 230.2824570127.

The spelling of 12211881 in words is "twelve million, two hundred eleven thousand, eight hundred eighty-one".