630006221 has 4 divisors (see below), whose sum is σ = 678468252. Its totient is φ = 581544192.

The previous prime is 630006203. The next prime is 630006227. The reversal of 630006221 is 122600036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24304900 + 605701321 = 4930^2 + 24611^2 .

It is a cyclic number.

It is not a de Polignac number, because 630006221 - 2¹⁰ = 630005197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630006193 and 630006202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630006227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24230996 + ... + 24231021.

It is an arithmetic number, because the mean of its divisors is an integer number (169617063).

Almost surely, 2^630006221 is an apocalyptic number.

It is an amenable number.

630006221 is a deficient number, since it is larger than the sum of its proper divisors (48462031).

630006221 is a wasteful number, since it uses less digits than its factorization.

630006221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48462030.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 630006221 is about 25099.9247210027. The cubic root of 630006221 is about 857.2647099290.

Adding to 630006221 its reverse (122600036), we get a palindrome (752606257).

The spelling of 630006221 in words is "six hundred thirty million, six thousand, two hundred twenty-one".