521417220 has 48 divisors (see below), whose sum is σ = 1484723520. Its totient is φ = 136686976.

The previous prime is 521417219. The next prime is 521417243. The reversal of 521417220 is 22714125.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70107 + ... + 77186.

It is an arithmetic number, because the mean of its divisors is an integer number (30931740).

Almost surely, 2^521417220 is an apocalyptic number.

It is an amenable number.

521417220 is an abundant number, since it is smaller than the sum of its proper divisors (963306300).

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

521417220 is a wasteful number, since it uses less digits than its factorization.

521417220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147364 (or 147362 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 521417220 is about 22834.5619620784. The cubic root of 521417220 is about 804.8750342905.

The spelling of 521417220 in words is "five hundred twenty-one million, four hundred seventeen thousand, two hundred twenty".