630221101 has 2 divisors, whose sum is σ = 630221102. Its totient is φ = 630221100.

The previous prime is 630221099. The next prime is 630221129. The reversal of 630221101 is 101122036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402965476 + 227255625 = 20074^2 + 15075^2 .

It is a cyclic number.

It is not a de Polignac number, because 630221101 - 2¹ = 630221099 is a prime.

It is a super-2 number, since 2×630221101² = 794357272291304402, which contains 22 as substring.

Together with 630221099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630221131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315110550 + 315110551.

It is an arithmetic number, because the mean of its divisors is an integer number (315110551).

Almost surely, 2^630221101 is an apocalyptic number.

It is an amenable number.

630221101 is a deficient number, since it is larger than the sum of its proper divisors (1).

630221101 is an equidigital number, since it uses as much as digits as its factorization.

630221101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 630221101 is about 25104.2048469972. The cubic root of 630221101 is about 857.3621629888.

Adding to 630221101 its reverse (101122036), we get a palindrome (731343137).

The spelling of 630221101 in words is "six hundred thirty million, two hundred twenty-one thousand, one hundred one".