521066621 has 8 divisors (see below), whose sum is σ = 549463200. Its totient is φ = 492767280.

The previous prime is 521066603. The next prime is 521066629. The reversal of 521066621 is 126660125.

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

It is not a de Polignac number, because 521066621 - 2¹⁸ = 520804477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521066629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13166 + ... + 34863.

It is an arithmetic number, because the mean of its divisors is an integer number (68682900).

Almost surely, 2^521066621 is an apocalyptic number.

It is an amenable number.

521066621 is a deficient number, since it is larger than the sum of its proper divisors (28396579).

521066621 is a wasteful number, since it uses less digits than its factorization.

521066621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48619.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 521066621 is about 22826.8837338783. The cubic root of 521066621 is about 804.6945955155.

The spelling of 521066621 in words is "five hundred twenty-one million, sixty-six thousand, six hundred twenty-one".