55215353324521 has 6 divisors (see below), whose sum is σ = 59789406262830. Its totient is φ = 50968018453248.

The previous prime is 55215353324501. The next prime is 55215353324581. The reversal of 55215353324521 is 12542335351255.

It can be written as a sum of positive squares in 3 ways, for example, as 1641575937600 + 53573777386921 = 1281240^2 + 7319411^2 .

It is not a de Polignac number, because 55215353324521 - 2⁷ = 55215353324393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55215353324501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 163359033336 + ... + 163359033673.

It is an arithmetic number, because the mean of its divisors is an integer number (9964901043805).

Almost surely, 2^{55215353324521} is an apocalyptic number.

It is an amenable number.

55215353324521 is a deficient number, since it is larger than the sum of its proper divisors (4574052938309).

55215353324521 is a wasteful number, since it uses less digits than its factorization.

55215353324521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326718067035 (or 326718067022 counting only the distinct ones).

The product of its digits is 2700000, while the sum is 46.

Adding to 55215353324521 its reverse (12542335351255), we get a palindrome (67757688675776).

The spelling of 55215353324521 in words is "fifty-five trillion, two hundred fifteen billion, three hundred fifty-three million, three hundred twenty-four thousand, five hundred twenty-one".