12021011001 has 12 divisors (see below), whose sum is σ = 17413726512. Its totient is φ = 7990910136.

The previous prime is 12021010943. The next prime is 12021011003. The reversal of 12021011001 is 10011012021.

It is a happy number.

It is not a de Polignac number, because 12021011001 - 2¹³ = 12021002809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12021011003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1921471 + ... + 1927716.

It is an arithmetic number, because the mean of its divisors is an integer number (1451143876).

Almost surely, 2^12021011001 is an apocalyptic number.

It is an amenable number.

12021011001 is a deficient number, since it is larger than the sum of its proper divisors (5392715511).

12021011001 is a wasteful number, since it uses less digits than its factorization.

12021011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849540 (or 3849537 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12021011001 its reverse (10011012021), we get a palindrome (22032023022).

The spelling of 12021011001 in words is "twelve billion, twenty-one million, eleven thousand, one".