551402212321 has 4 divisors (see below), whose sum is σ = 551414623792. Its totient is φ = 551389800852.

The previous prime is 551402212307. The next prime is 551402212343. The reversal of 551402212321 is 123212204155.

It is a happy number.

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 not a de Polignac number, because 551402212321 - 2⁵ = 551402212289 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 551402212321.

It is not an unprimeable number, because it can be changed into a prime (551402212421) 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, 6138855 + ... + 6228028.

It is an arithmetic number, because the mean of its divisors is an integer number (137853655948).

Almost surely, 2^551402212321 is an apocalyptic number.

It is an amenable number.

551402212321 is a deficient number, since it is larger than the sum of its proper divisors (12411471).

551402212321 is a wasteful number, since it uses less digits than its factorization.

551402212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12411470.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 551402212321 its reverse (123212204155), we get a palindrome (674614416476).

The spelling of 551402212321 in words is "five hundred fifty-one billion, four hundred two million, two hundred twelve thousand, three hundred twenty-one".