551215534221 has 12 divisors (see below), whose sum is σ = 868582054080. Its totient is φ = 334070020680.

The previous prime is 551215534187. The next prime is 551215534297. The reversal of 551215534221 is 122435512155.

551215534221 is a `hidden beast` number, since 55 + 12 + 1 + 553 + 42 + 2 + 1 = 666.

It is not a de Polignac number, because 551215534221 - 2¹⁴ = 551215517837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551215534721) 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 11 ways as a sum of consecutive naturals, for example, 2783916741 + ... + 2783916938.

It is an arithmetic number, because the mean of its divisors is an integer number (72381837840).

Almost surely, 2^551215534221 is an apocalyptic number.

It is an amenable number.

551215534221 is a deficient number, since it is larger than the sum of its proper divisors (317366519859).

551215534221 is a wasteful number, since it uses less digits than its factorization.

551215534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5567833696 (or 5567833693 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The spelling of 551215534221 in words is "five hundred fifty-one billion, two hundred fifteen million, five hundred thirty-four thousand, two hundred twenty-one".