12211111001 has 4 divisors (see below), whose sum is σ = 12212132532. Its totient is φ = 12210089472.

The previous prime is 12211110979. The next prime is 12211111021. The reversal of 12211111001 is 10011111221.

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 368448025 + 11842662976 = 19195^2 + 108824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211111001 is a prime.

It is a super-2 number, since 2×12211111001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211111021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492620 + ... + 516813.

It is an arithmetic number, because the mean of its divisors is an integer number (3053033133).

Almost surely, 2^12211111001 is an apocalyptic number.

It is an amenable number.

12211111001 is a deficient number, since it is larger than the sum of its proper divisors (1021531).

12211111001 is a wasteful number, since it uses less digits than its factorization.

12211111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021530.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12211111001 its reverse (10011111221), we get a palindrome (22222222222).

The spelling of 12211111001 in words is "twelve billion, two hundred eleven million, one hundred eleven thousand, one".