551240232421 has 8 divisors (see below), whose sum is σ = 575606960640. Its totient is φ = 526906817712.

The previous prime is 551240232377. The next prime is 551240232449. The reversal of 551240232421 is 124232042155.

It is a happy number.

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 551240232421 - 2³¹ = 549092748773 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 (551240232461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8294550 + ... + 8360743.

It is an arithmetic number, because the mean of its divisors is an integer number (71950870080).

Almost surely, 2^551240232421 is an apocalyptic number.

It is an amenable number.

551240232421 is a deficient number, since it is larger than the sum of its proper divisors (24366728219).

551240232421 is a wasteful number, since it uses less digits than its factorization.

551240232421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16656755.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 551240232421 its reverse (124232042155), we get a palindrome (675472274576).

The spelling of 551240232421 in words is "five hundred fifty-one billion, two hundred forty million, two hundred thirty-two thousand, four hundred twenty-one".