12221221001 has 32 divisors (see below), whose sum is σ = 14706437760. Its totient is φ = 10028339200.

The previous prime is 12221220971. The next prime is 12221221003. The reversal of 12221221001 is 10012212221.

It is a de Polignac number, because none of the positive numbers 2^k-12221221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221221003) 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 31 ways as a sum of consecutive naturals, for example, 438845 + ... + 465861.

It is an arithmetic number, because the mean of its divisors is an integer number (459576180).

Almost surely, 2^12221221001 is an apocalyptic number.

12221221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221221001 is a deficient number, since it is larger than the sum of its proper divisors (2485216759).

12221221001 is a wasteful number, since it uses less digits than its factorization.

12221221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27145.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12221221001 its reverse (10012212221), we get a palindrome (22233433222).

The spelling of 12221221001 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one".