11972321 has 2 divisors, whose sum is σ = 11972322. Its totient is φ = 11972320.

The previous prime is 11972309. The next prime is 11972327. The reversal of 11972321 is 12327911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10471696 + 1500625 = 3236^2 + 1225^2 .

It is an emirp because it is prime and its reverse (12327911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11972321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11972327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5986160 + 5986161.

It is an arithmetic number, because the mean of its divisors is an integer number (5986161).

Almost surely, 2^11972321 is an apocalyptic number.

It is an amenable number.

11972321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11972321 is an equidigital number, since it uses as much as digits as its factorization.

11972321 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 11972321 is about 3460.1041891827. The cubic root of 11972321 is about 228.7666877451.

The spelling of 11972321 in words is "eleven million, nine hundred seventy-two thousand, three hundred twenty-one".