551212511321 has 4 divisors (see below), whose sum is σ = 551676886992. Its totient is φ = 550748135652.

The previous prime is 551212511263. The next prime is 551212511327. The reversal of 551212511321 is 123115212155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551212511321 is a prime.

It is a super-3 number, since 3×551212511321³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551212511327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232186055 + ... + 232188428.

It is an arithmetic number, because the mean of its divisors is an integer number (137919221748).

Almost surely, 2^551212511321 is an apocalyptic number.

It is an amenable number.

551212511321 is a deficient number, since it is larger than the sum of its proper divisors (464375671).

551212511321 is a wasteful number, since it uses less digits than its factorization.

551212511321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464375670.

The product of its digits is 3000, while the sum is 29.

Adding to 551212511321 its reverse (123115212155), we get a palindrome (674327723476).

The spelling of 551212511321 in words is "five hundred fifty-one billion, two hundred twelve million, five hundred eleven thousand, three hundred twenty-one".