553430221 has 4 divisors (see below), whose sum is σ = 555805692. Its totient is φ = 551054752.

The previous prime is 553430219. The next prime is 553430239. The reversal of 553430221 is 122034355.

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 219454596 + 333975625 = 14814^2 + 18275^2 .

It is a cyclic number.

It is not a de Polignac number, because 553430221 - 2¹ = 553430219 is a prime.

It is a super-2 number, since 2×553430221² = 612570019032217682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553430261) 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, 1187386 + ... + 1187851.

It is an arithmetic number, because the mean of its divisors is an integer number (138951423).

Almost surely, 2^553430221 is an apocalyptic number.

It is an amenable number.

553430221 is a deficient number, since it is larger than the sum of its proper divisors (2375471).

553430221 is a wasteful number, since it uses less digits than its factorization.

553430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375470.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 553430221 is about 23525.0976831128. The cubic root of 553430221 is about 821.0210466470.

Adding to 553430221 its reverse (122034355), we get a palindrome (675464576).

The spelling of 553430221 in words is "five hundred fifty-three million, four hundred thirty thousand, two hundred twenty-one".