521106012 has 72 divisors (see below), whose sum is σ = 1510943616. Its totient is φ = 148341024.

The previous prime is 521105987. The next prime is 521106073. The reversal of 521106012 is 210601125.

521106012 is a `hidden beast` number, since 52 + 1 + 10 + 601 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67663 + ... + 74969.

It is an arithmetic number, because the mean of its divisors is an integer number (20985328).

Almost surely, 2^521106012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521106012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755471808).

521106012 is an abundant number, since it is smaller than the sum of its proper divisors (989837604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521106012 is a wasteful number, since it uses less digits than its factorization.

521106012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7602 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 521106012 is about 22827.7465379305. The cubic root of 521106012 is about 804.7148724659.

Adding to 521106012 its reverse (210601125), we get a palindrome (731707137).

The spelling of 521106012 in words is "five hundred twenty-one million, one hundred six thousand, twelve".