630042221 has 4 divisors (see below), whose sum is σ = 640370844. Its totient is φ = 619713600.

The previous prime is 630042211. The next prime is 630042227. The reversal of 630042221 is 122240036.

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 29106025 + 600936196 = 5395^2 + 24514^2 .

It is a cyclic number.

It is not a de Polignac number, because 630042221 - 2¹⁸ = 629780077 is a prime.

It is a super-2 number, since 2×630042221² = 793906400485225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 630042193 and 630042202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630042227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5164220 + ... + 5164341.

It is an arithmetic number, because the mean of its divisors is an integer number (160092711).

Almost surely, 2^630042221 is an apocalyptic number.

630042221 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

630042221 is a deficient number, since it is larger than the sum of its proper divisors (10328623).

630042221 is a wasteful number, since it uses less digits than its factorization.

630042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10328622.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 630042221 is about 25100.6418443832. The cubic root of 630042221 is about 857.2810383084.

Adding to 630042221 its reverse (122240036), we get a palindrome (752282257).

The spelling of 630042221 in words is "six hundred thirty million, forty-two thousand, two hundred twenty-one".