521064421 has 8 divisors (see below), whose sum is σ = 526176288. Its totient is φ = 515970000.

The previous prime is 521064407. The next prime is 521064457. The reversal of 521064421 is 124460125.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 521064421 - 2¹³ = 521056229 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 (521064221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60271 + ... + 68371.

It is an arithmetic number, because the mean of its divisors is an integer number (65772036).

Almost surely, 2^521064421 is an apocalyptic number.

It is an amenable number.

521064421 is a deficient number, since it is larger than the sum of its proper divisors (5111867).

521064421 is a wasteful number, since it uses less digits than its factorization.

521064421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 521064421 is about 22826.8355450334. The cubic root of 521064421 is about 804.6934630112.

The spelling of 521064421 in words is "five hundred twenty-one million, sixty-four thousand, four hundred twenty-one".