72023321 has 2 divisors, whose sum is σ = 72023322. Its totient is φ = 72023320.

The previous prime is 72023297. The next prime is 72023363. The reversal of 72023321 is 12332027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 19678096 = 7235^2 + 4436^2 .

It is an emirp because it is prime and its reverse (12332027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72023321 - 2⁶ = 72023257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72023293 and 72023302.

It is not a weakly prime, because it can be changed into another prime (72023381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36011660 + 36011661.

It is an arithmetic number, because the mean of its divisors is an integer number (36011661).

Almost surely, 2^72023321 is an apocalyptic number.

It is an amenable number.

72023321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72023321 is an equidigital number, since it uses as much as digits as its factorization.

72023321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 72023321 is about 8486.6554660832. The cubic root of 72023321 is about 416.0616760903.

Adding to 72023321 its reverse (12332027), we get a palindrome (84355348).

The spelling of 72023321 in words is "seventy-two million, twenty-three thousand, three hundred twenty-one".