12211211001001 has 4 divisors (see below), whose sum is σ = 12211343310852. Its totient is φ = 12211078691152.

The previous prime is 12211211000951. The next prime is 12211211001013. The reversal of 12211211001001 is 10010011211221.

It is a happy number.

12211211001001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8704411704976 + 3506799296025 = 2950324^2 + 1872645^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211211001001 - 2⁷ = 12211211000873 is a prime.

It is a super-2 number, since 2×12211211001001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211211001061) 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, 66016390 + ... + 66201103.

It is an arithmetic number, because the mean of its divisors is an integer number (3052835827713).

Almost surely, 2^{12211211001001} is an apocalyptic number.

It is an amenable number.

12211211001001 is a deficient number, since it is larger than the sum of its proper divisors (132309851).

12211211001001 is an equidigital number, since it uses as much as digits as its factorization.

12211211001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132309850.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12211211001001 its reverse (10010011211221), we get a palindrome (22221222212222).

The spelling of 12211211001001 in words is "twelve trillion, two hundred eleven billion, two hundred eleven million, one thousand, one".