634221 has 12 divisors (see below), whose sum is σ = 1047072. Its totient is φ = 362376.

The previous prime is 634211. The next prime is 634223. The reversal of 634221 is 122436.

It is a happy number.

It is not a de Polignac number, because 634221 - 2⁶ = 634157 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 634194 and 634203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4971 + ... + 5096.

It is an arithmetic number, because the mean of its divisors is an integer number (87256).

2⁶³⁴²²¹ is an apocalyptic number.

It is an amenable number.

634221 is a deficient number, since it is larger than the sum of its proper divisors (412851).

634221 is a wasteful number, since it uses less digits than its factorization.

634221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10080 (or 10077 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 634221 is about 796.3799344534. The cubic root of 634221 is about 85.9172179795.

Adding to 634221 its reverse (122436), we get a palindrome (756657).

The spelling of 634221 in words is "six hundred thirty-four thousand, two hundred twenty-one".