551424021 has 8 divisors (see below), whose sum is σ = 735514464. Its totient is φ = 367474800.

The previous prime is 551424017. The next prime is 551424043. The reversal of 551424021 is 120424155.

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

It is not a de Polignac number, because 551424021 - 2² = 551424017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551423982 and 551424000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551424421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25830 + ... + 42071.

It is an arithmetic number, because the mean of its divisors is an integer number (91939308).

Almost surely, 2^551424021 is an apocalyptic number.

It is an amenable number.

551424021 is a deficient number, since it is larger than the sum of its proper divisors (184090443).

551424021 is a wasteful number, since it uses less digits than its factorization.

551424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70611.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 551424021 is about 23482.4194026084. The cubic root of 551424021 is about 820.0277707232.

Adding to 551424021 its reverse (120424155), we get a palindrome (671848176).

The spelling of 551424021 in words is "five hundred fifty-one million, four hundred twenty-four thousand, twenty-one".