12001971 has 8 divisors (see below), whose sum is σ = 16393104. Its totient is φ = 7806080.

The previous prime is 12001963. The next prime is 12001981. The reversal of 12001971 is 17910021.

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 12001971 - 2³ = 12001963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001921) 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 7 ways as a sum of consecutive naturals, for example, 48666 + ... + 48911.

It is an arithmetic number, because the mean of its divisors is an integer number (2049138).

Almost surely, 2^12001971 is an apocalyptic number.

12001971 is a deficient number, since it is larger than the sum of its proper divisors (4391133).

12001971 is an equidigital number, since it uses as much as digits as its factorization.

12001971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97621.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 12001971 is about 3464.3860928020. The cubic root of 12001971 is about 228.9553824454.

Adding to 12001971 its reverse (17910021), we get a palindrome (29911992).

The spelling of 12001971 in words is "twelve million, one thousand, nine hundred seventy-one".