634221321 has 8 divisors (see below), whose sum is σ = 847803840. Its totient is φ = 421726512.

The previous prime is 634221317. The next prime is 634221323. The reversal of 634221321 is 123122436.

634221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 634221321 - 2² = 634221317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634221291 and 634221300.

It is not an unprimeable number, because it can be changed into a prime (634221323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270565 + ... + 272898.

It is an arithmetic number, because the mean of its divisors is an integer number (105975480).

Almost surely, 2^634221321 is an apocalyptic number.

It is an amenable number.

634221321 is a deficient number, since it is larger than the sum of its proper divisors (213582519).

634221321 is a wasteful number, since it uses less digits than its factorization.

634221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543855.

The product of its digits is 1728, while the sum is 24.

The square root of 634221321 is about 25183.7511304412. The cubic root of 634221321 is about 859.1723247465.

Adding to 634221321 its reverse (123122436), we get a palindrome (757343757).

The spelling of 634221321 in words is "six hundred thirty-four million, two hundred twenty-one thousand, three hundred twenty-one".