12172221001 has 4 divisors (see below), whose sum is σ = 12455295952. Its totient is φ = 11889146052.

The previous prime is 12172220993. The next prime is 12172221031. The reversal of 12172221001 is 10012227121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12172221001 - 2³ = 12172220993 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 12172221001.

It is not an unprimeable number, because it can be changed into a prime (12172221031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141537411 + ... + 141537496.

It is an arithmetic number, because the mean of its divisors is an integer number (3113823988).

Almost surely, 2^12172221001 is an apocalyptic number.

It is an amenable number.

12172221001 is a deficient number, since it is larger than the sum of its proper divisors (283074951).

12172221001 is an equidigital number, since it uses as much as digits as its factorization.

12172221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283074950.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 12172221001 its reverse (10012227121), we get a palindrome (22184448122).

The spelling of 12172221001 in words is "twelve billion, one hundred seventy-two million, two hundred twenty-one thousand, one".