12371921 has 2 divisors, whose sum is σ = 12371922. Its totient is φ = 12371920.

The previous prime is 12371881. The next prime is 12371923. The reversal of 12371921 is 12917321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8526400 + 3845521 = 2920^2 + 1961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12371921 is a prime.

Together with 12371923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12371923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6185960 + 6185961.

It is an arithmetic number, because the mean of its divisors is an integer number (6185961).

Almost surely, 2^12371921 is an apocalyptic number.

It is an amenable number.

12371921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12371921 is an equidigital number, since it uses as much as digits as its factorization.

12371921 is an evil number, because the sum of its binary digits is even.

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

The square root of 12371921 is about 3517.3741626389. The cubic root of 12371921 is about 231.2840654953.

The spelling of 12371921 in words is "twelve million, three hundred seventy-one thousand, nine hundred twenty-one".