12321971 has 2 divisors, whose sum is σ = 12321972. Its totient is φ = 12321970.

The previous prime is 12321949. The next prime is 12321977. The reversal of 12321971 is 17912321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12321971 - 2²² = 8127667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12321971.

It is not a weakly prime, because it can be changed into another prime (12321977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160985 + 6160986.

It is an arithmetic number, because the mean of its divisors is an integer number (6160986).

Almost surely, 2^12321971 is an apocalyptic number.

12321971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12321971 is an equidigital number, since it uses as much as digits as its factorization.

12321971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 12321971 is about 3510.2665140983. The cubic root of 12321971 is about 230.9723860222.

The spelling of 12321971 in words is "twelve million, three hundred twenty-one thousand, nine hundred seventy-one".