521210055 has 24 divisors (see below), whose sum is σ = 885884112. Its totient is φ = 261624832.

The previous prime is 521210051. The next prime is 521210057. The reversal of 521210055 is 550012125.

It is not a de Polignac number, because 521210055 - 2² = 521210051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521210051) 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 23 ways as a sum of consecutive naturals, for example, 55782 + ... + 64451.

It is an arithmetic number, because the mean of its divisors is an integer number (36911838).

Almost surely, 2^521210055 is an apocalyptic number.

521210055 is a deficient number, since it is larger than the sum of its proper divisors (364674057).

521210055 is a wasteful number, since it uses less digits than its factorization.

521210055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120275 (or 120258 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 521210055 is about 22830.0252956496. The cubic root of 521210055 is about 804.7684248309.

The spelling of 521210055 in words is "five hundred twenty-one million, two hundred ten thousand, fifty-five".