553345221 has 24 divisors (see below), whose sum is σ = 873352480. Its totient is φ = 309561120.

The previous prime is 553345217. The next prime is 553345237. The reversal of 553345221 is 122543355.

It is not a de Polignac number, because 553345221 - 2² = 553345217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553345211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53911 + ... + 63348.

Almost surely, 2^553345221 is an apocalyptic number.

It is an amenable number.

553345221 is a deficient number, since it is larger than the sum of its proper divisors (320007259).

553345221 is a wasteful number, since it uses less digits than its factorization.

553345221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117297 (or 117286 counting only the distinct ones).

The product of its digits is 18000, while the sum is 30.

The square root of 553345221 is about 23523.2910325065. The cubic root of 553345221 is about 820.9790116205.

Adding to 553345221 its reverse (122543355), we get a palindrome (675888576).

The spelling of 553345221 in words is "five hundred fifty-three million, three hundred forty-five thousand, two hundred twenty-one".