551320221220 has 24 divisors (see below), whose sum is σ = 1157910272064. Its totient is φ = 220501839456.

The previous prime is 551320221197. The next prime is 551320221241. The reversal of 551320221220 is 22122023155.

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 7 ways as a sum of consecutive naturals, for example, 1467894 + ... + 1804813.

It is an arithmetic number, because the mean of its divisors is an integer number (48246261336).

Almost surely, 2^551320221220 is an apocalyptic number.

It is an amenable number.

551320221220 is an abundant number, since it is smaller than the sum of its proper divisors (606590050844).

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

551320221220 is a wasteful number, since it uses less digits than its factorization.

551320221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281139 (or 3281137 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 551320221220 its reverse (22122023155), we get a palindrome (573442244375).

The spelling of 551320221220 in words is "five hundred fifty-one billion, three hundred twenty million, two hundred twenty-one thousand, two hundred twenty".