55321032471721 has 9 divisors (see below), whose sum is σ = 55381038762231. Its totient is φ = 55261091152872.

The previous prime is 55321032471689. The next prime is 55321032471769. The reversal of 55321032471721 is 12717423012355.

The square root of 55321032471721 is 7437811.

It is a perfect power (a square), and thus also a powerful number.

55321032471721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 17675003347225 + 37646029124496 = 4204165^2 + 6135636^2 .

It is not a de Polignac number, because 55321032471721 - 2⁵ = 55321032471689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55321032471521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7906389595 + ... + 7906396591.

It is an arithmetic number, because the mean of its divisors is an integer number (6153448751359).

Almost surely, 2^{55321032471721} is an apocalyptic number.

55321032471721 is the 7437811-st square number.

55321032471721 is the 3718906-th centered octagonal number.

It is an amenable number.

55321032471721 is a deficient number, since it is larger than the sum of its proper divisors (60006290510).

55321032471721 is an frugal number, since it uses more digits than its factorization.

55321032471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16120 (or 8060 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 55321032471721 in words is "fifty-five trillion, three hundred twenty-one billion, thirty-two million, four hundred seventy-one thousand, seven hundred twenty-one".