521121066 has 8 divisors (see below), whose sum is σ = 1042242144. Its totient is φ = 173707020.

The previous prime is 521121059. The next prime is 521121079. The reversal of 521121066 is 660121125.

It is a sphenic number, since it is the product of 3 distinct primes.

521121066 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 43426750 + ... + 43426761.

It is an arithmetic number, because the mean of its divisors is an integer number (130280268).

Almost surely, 2^521121066 is an apocalyptic number.

521121066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521121066 is a wasteful number, since it uses less digits than its factorization.

521121066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86853516.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 521121066 is about 22828.0762658617. The cubic root of 521121066 is about 804.7226214081.

The spelling of 521121066 in words is "five hundred twenty-one million, one hundred twenty-one thousand, sixty-six".