555016221 has 48 divisors (see below), whose sum is σ = 879016320. Its totient is φ = 336061440.

The previous prime is 555016211. The next prime is 555016237. The reversal of 555016221 is 122610555.

It is not a de Polignac number, because 555016221 - 2⁹ = 555015709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555016211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 645690 + ... + 646548.

It is an arithmetic number, because the mean of its divisors is an integer number (18312840).

Almost surely, 2^555016221 is an apocalyptic number.

555016221 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

555016221 is a deficient number, since it is larger than the sum of its proper divisors (324000099).

555016221 is a wasteful number, since it uses less digits than its factorization.

555016221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 555016221 is about 23558.7822478158. The cubic root of 555016221 is about 821.8045826333.

Adding to 555016221 its reverse (122610555), we get a palindrome (677626776).

The spelling of 555016221 in words is "five hundred fifty-five million, sixteen thousand, two hundred twenty-one".