521006223 has 4 divisors (see below), whose sum is σ = 694674968. Its totient is φ = 347337480.

The previous prime is 521006221. The next prime is 521006237. The reversal of 521006223 is 322600125.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 521006223 - 2¹ = 521006221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521006223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521006221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86834368 + ... + 86834373.

It is an arithmetic number, because the mean of its divisors is an integer number (173668742).

Almost surely, 2^521006223 is an apocalyptic number.

521006223 is a deficient number, since it is larger than the sum of its proper divisors (173668745).

521006223 is a wasteful number, since it uses less digits than its factorization.

521006223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173668744.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 521006223 is about 22825.5607379096. The cubic root of 521006223 is about 804.6635029961.

Adding to 521006223 its reverse (322600125), we get a palindrome (843606348).

The spelling of 521006223 in words is "five hundred twenty-one million, six thousand, two hundred twenty-three".