12320921 has 2 divisors, whose sum is σ = 12320922. Its totient is φ = 12320920.

The previous prime is 12320897. The next prime is 12320933. The reversal of 12320921 is 12902321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 3200521 = 3020^2 + 1789^2 .

It is a cyclic number.

It is not a de Polignac number, because 12320921 - 2²² = 8126617 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12320893 and 12320902.

It is not a weakly prime, because it can be changed into another prime (12220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160460 + 6160461.

It is an arithmetic number, because the mean of its divisors is an integer number (6160461).

Almost surely, 2^12320921 is an apocalyptic number.

It is an amenable number.

12320921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320921 is an equidigital number, since it uses as much as digits as its factorization.

12320921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12320921 is about 3510.1169496186. The cubic root of 12320921 is about 230.9658251699.

The spelling of 12320921 in words is "twelve million, three hundred twenty thousand, nine hundred twenty-one".