551104021 has 4 divisors (see below), whose sum is σ = 593496652. Its totient is φ = 508711392.

The previous prime is 551103997. The next prime is 551104049. The reversal of 551104021 is 120401155.

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 357588100 + 193515921 = 18910^2 + 13911^2 .

It is a cyclic number.

It is not a de Polignac number, because 551104021 - 2⁷ = 551103893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 551104021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551104061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21196296 + ... + 21196321.

It is an arithmetic number, because the mean of its divisors is an integer number (148374163).

Almost surely, 2^551104021 is an apocalyptic number.

It is an amenable number.

551104021 is a deficient number, since it is larger than the sum of its proper divisors (42392631).

551104021 is a wasteful number, since it uses less digits than its factorization.

551104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42392630.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 551104021 is about 23475.6048058405. The cubic root of 551104021 is about 819.8691150408.

Adding to 551104021 its reverse (120401155), we get a palindrome (671505176).

The spelling of 551104021 in words is "five hundred fifty-one million, one hundred four thousand, twenty-one".