521821230 has 32 divisors (see below), whose sum is σ = 1431281664. Its totient is φ = 119273376.

The previous prime is 521821229. The next prime is 521821253. The reversal of 521821230 is 32128125.

It is a self number, because there is not a number n which added to its sum of digits gives 521821230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242222 + ... + 1242641.

It is an arithmetic number, because the mean of its divisors is an integer number (44727552).

Almost surely, 2^521821230 is an apocalyptic number.

521821230 is an abundant number, since it is smaller than the sum of its proper divisors (909460434).

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

521821230 is a wasteful number, since it uses less digits than its factorization.

521821230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484880.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 521821230 is about 22843.4067074068. The cubic root of 521821230 is about 805.0828612158.

Adding to 521821230 its reverse (32128125), we get a palindrome (553949355).

The spelling of 521821230 in words is "five hundred twenty-one million, eight hundred twenty-one thousand, two hundred thirty".