12012001989 has 16 divisors (see below), whose sum is σ = 18155793600. Its totient is φ = 7002948096.

The previous prime is 12012001979. The next prime is 12012001999. The reversal of 12012001989 is 98910021021.

It is an interprime number because it is at equal distance from previous prime (12012001979) and next prime (12012001999).

It is not a de Polignac number, because 12012001989 - 2⁵ = 12012001957 is a prime.

It is a super-2 number, since 2×12012001989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012001949) 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 15 ways as a sum of consecutive naturals, for example, 8104524 + ... + 8106005.

It is an arithmetic number, because the mean of its divisors is an integer number (1134737100).

Almost surely, 2^12012001989 is an apocalyptic number.

12012001989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12012001989 is a deficient number, since it is larger than the sum of its proper divisors (6143791611).

12012001989 is a wasteful number, since it uses less digits than its factorization.

12012001989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16210564.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 12012001989 in words is "twelve billion, twelve million, one thousand, nine hundred eighty-nine".