55512210521 has 4 divisors (see below), whose sum is σ = 55539252132. Its totient is φ = 55485168912.

The previous prime is 55512210497. The next prime is 55512210583. The reversal of 55512210521 is 12501221555.

55512210521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39784291600 + 15727918921 = 199460^2 + 125411^2 .

It is a cyclic number.

It is not a de Polignac number, because 55512210521 - 2¹⁰ = 55512209497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55512210421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13517726 + ... + 13521831.

It is an arithmetic number, because the mean of its divisors is an integer number (13884813033).

Almost surely, 2^55512210521 is an apocalyptic number.

It is an amenable number.

55512210521 is a deficient number, since it is larger than the sum of its proper divisors (27041611).

55512210521 is a wasteful number, since it uses less digits than its factorization.

55512210521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27041610.

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 55512210521 in words is "fifty-five billion, five hundred twelve million, two hundred ten thousand, five hundred twenty-one".