12211001 has 16 divisors (see below), whose sum is σ = 13953600. Its totient is φ = 10584000.

The previous prime is 12210983. The next prime is 12211009. The reversal of 12211001 is 10011221.

It is a cyclic number.

It is not a de Polignac number, because 12211001 - 2⁶ = 12210937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211001.

It is not an unprimeable number, because it can be changed into a prime (12211009) 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 15 ways as a sum of consecutive naturals, for example, 32030 + ... + 32408.

It is an arithmetic number, because the mean of its divisors is an integer number (872100).

Almost surely, 2^12211001 is an apocalyptic number.

12211001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12211001 is a deficient number, since it is larger than the sum of its proper divisors (1742599).

12211001 is a wasteful number, since it uses less digits than its factorization.

12211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 12211001 is about 3494.4242730384. The cubic root of 12211001 is about 230.2769254207.

Adding to 12211001 its reverse (10011221), we get a palindrome (22222222).

It can be divided in two parts, 1221 and 1001, that multiplied together give a palindrome (1222221).

The spelling of 12211001 in words is "twelve million, two hundred eleven thousand, one".