551221511100 has 144 divisors (see below), whose sum is σ = 1759441659360. Its totient is φ = 132375859200.

The previous prime is 551221511089. The next prime is 551221511117. The reversal of 551221511100 is 1115122155.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1563745 + ... + 1883544.

Almost surely, 2^551221511100 is an apocalyptic number.

551221511100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

551221511100 is an abundant number, since it is smaller than the sum of its proper divisors (1208220148260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551221511100 is a wasteful number, since it uses less digits than its factorization.

551221511100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447360 (or 3447353 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 24.

Adding to 551221511100 its reverse (1115122155), we get a palindrome (552336633255).

The spelling of 551221511100 in words is "five hundred fifty-one billion, two hundred twenty-one million, five hundred eleven thousand, one hundred".