551320221434221 has 8 divisors (see below), whose sum is σ = 553240720185120. Its totient is φ = 549401628889008.

The previous prime is 551320221434189. The next prime is 551320221434233. The reversal of 551320221434221 is 122434122023155.

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

It is a cyclic number.

It is not a de Polignac number, because 551320221434221 - 2⁵ = 551320221434189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551320221438221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 475971966 + ... + 477128863.

It is an arithmetic number, because the mean of its divisors is an integer number (69155090023140).

Almost surely, 2^{551320221434221} is an apocalyptic number.

It is an amenable number.

551320221434221 is a deficient number, since it is larger than the sum of its proper divisors (1920498750899).

551320221434221 is a wasteful number, since it uses less digits than its factorization.

551320221434221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953102843.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 551320221434221 its reverse (122434122023155), we get a palindrome (673754343457376).

The spelling of 551320221434221 in words is "five hundred fifty-one trillion, three hundred twenty billion, two hundred twenty-one million, four hundred thirty-four thousand, two hundred twenty-one".