551300421 has 24 divisors (see below), whose sum is σ = 856668960. Its totient is φ = 314442912.

The previous prime is 551300417. The next prime is 551300437. The reversal of 551300421 is 124003155.

It is not a de Polignac number, because 551300421 - 2² = 551300417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551300401) 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 23 ways as a sum of consecutive naturals, for example, 83095 + ... + 89483.

It is an arithmetic number, because the mean of its divisors is an integer number (35694540).

Almost surely, 2^551300421 is an apocalyptic number.

It is an amenable number.

551300421 is a deficient number, since it is larger than the sum of its proper divisors (305368539).

551300421 is a wasteful number, since it uses less digits than its factorization.

551300421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6993 (or 6986 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 551300421 is about 23479.7874990384. The cubic root of 551300421 is about 819.9664972431.

Adding to 551300421 its reverse (124003155), we get a palindrome (675303576).

The spelling of 551300421 in words is "five hundred fifty-one million, three hundred thousand, four hundred twenty-one".