12111001001 has 16 divisors (see below), whose sum is σ = 13357795968. Its totient is φ = 10888752000.

The previous prime is 12111000989. The next prime is 12111001039. The reversal of 12111001001 is 10010011121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12111001001 - 2²⁶ = 12043892137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12111001001.

It is not an unprimeable number, because it can be changed into a prime (12111001081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1068701 + ... + 1079973.

It is an arithmetic number, because the mean of its divisors is an integer number (834862248).

Almost surely, 2^12111001001 is an apocalyptic number.

12111001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111001001 is a deficient number, since it is larger than the sum of its proper divisors (1246794967).

12111001001 is a wasteful number, since it uses less digits than its factorization.

12111001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12352.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 12111001001 its reverse (10010011121), we get a palindrome (22121012122).

The spelling of 12111001001 in words is "twelve billion, one hundred eleven million, one thousand, one".