12111021001 has 8 divisors (see below), whose sum is σ = 12220621704. Its totient is φ = 12001463040.

The previous prime is 12111020989. The next prime is 12111021011. The reversal of 12111021001 is 10012011121.

It can be written as a sum of positive squares in 4 ways, for example, as 2086205625 + 10024815376 = 45675^2 + 100124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111021001 - 2³³ = 3521086409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111021011) 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 7 ways as a sum of consecutive naturals, for example, 922455 + ... + 935491.

It is an arithmetic number, because the mean of its divisors is an integer number (1527577713).

Almost surely, 2^12111021001 is an apocalyptic number.

It is an amenable number.

12111021001 is a deficient number, since it is larger than the sum of its proper divisors (109600703).

12111021001 is a wasteful number, since it uses less digits than its factorization.

12111021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21371.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 12111021001 its reverse (10012011121), we get a palindrome (22123032122).

The spelling of 12111021001 in words is "twelve billion, one hundred eleven million, twenty-one thousand, one".