375216221 has 2 divisors, whose sum is σ = 375216222. Its totient is φ = 375216220.

The previous prime is 375216187. The next prime is 375216229. The reversal of 375216221 is 122612573.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375196900 + 19321 = 19370^2 + 139^2 .

It is an emirp because it is prime and its reverse (122612573) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-375216221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (375216229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 187608110 + 187608111.

It is an arithmetic number, because the mean of its divisors is an integer number (187608111).

Almost surely, 2^375216221 is an apocalyptic number.

It is an amenable number.

375216221 is a deficient number, since it is larger than the sum of its proper divisors (1).

375216221 is an equidigital number, since it uses as much as digits as its factorization.

375216221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 29.

The square root of 375216221 is about 19370.4987287370. The cubic root of 375216221 is about 721.2633561440.

Adding to 375216221 its reverse (122612573), we get a palindrome (497828794).

The spelling of 375216221 in words is "three hundred seventy-five million, two hundred sixteen thousand, two hundred twenty-one".