1630440221 has 2 divisors, whose sum is σ = 1630440222. Its totient is φ = 1630440220.

The previous prime is 1630440209. The next prime is 1630440239. The reversal of 1630440221 is 1220440361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934219225 + 696220996 = 30565^2 + 26386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630440221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630440281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815220110 + 815220111.

It is an arithmetic number, because the mean of its divisors is an integer number (815220111).

Almost surely, 2^1630440221 is an apocalyptic number.

It is an amenable number.

1630440221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630440221 is an equidigital number, since it uses as much as digits as its factorization.

1630440221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1630440221 is about 40378.7099967297. The cubic root of 1630440221 is about 1176.9778599570.

Adding to 1630440221 its reverse (1220440361), we get a palindrome (2850880582).

The spelling of 1630440221 in words is "one billion, six hundred thirty million, four hundred forty thousand, two hundred twenty-one".