821718050 has 12 divisors (see below), whose sum is σ = 1528395666. Its totient is φ = 328687200.

The previous prime is 821718049. The next prime is 821718059. The reversal of 821718050 is 50817128.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 643789129 + 177928921 = 25373^2 + 13339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 821717998 and 821718016.

It is not an unprimeable number, because it can be changed into a prime (821718059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8217131 + ... + 8217230.

Almost surely, 2^821718050 is an apocalyptic number.

821718050 is a deficient number, since it is larger than the sum of its proper divisors (706677616).

821718050 is a wasteful number, since it uses less digits than its factorization.

821718050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16434373 (or 16434368 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 821718050 is about 28665.6248841709. The cubic root of 821718050 is about 936.6433965138.

The spelling of 821718050 in words is "eight hundred twenty-one million, seven hundred eighteen thousand, fifty".