72200321 has 2 divisors, whose sum is σ = 72200322. Its totient is φ = 72200320.

The previous prime is 72200299. The next prime is 72200329. The reversal of 72200321 is 12300227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44742721 + 27457600 = 6689^2 + 5240^2 .

It is an emirp because it is prime and its reverse (12300227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72200321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72200321.

It is not a weakly prime, because it can be changed into another prime (72200329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36100160 + 36100161.

It is an arithmetic number, because the mean of its divisors is an integer number (36100161).

Almost surely, 2^72200321 is an apocalyptic number.

It is an amenable number.

72200321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72200321 is an equidigital number, since it uses as much as digits as its factorization.

72200321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 72200321 is about 8497.0772033682. The cubic root of 72200321 is about 416.4022263044.

Adding to 72200321 its reverse (12300227), we get a palindrome (84500548).

The spelling of 72200321 in words is "seventy-two million, two hundred thousand, three hundred twenty-one".