821325730 has 32 divisors (see below), whose sum is σ = 1558310400. Its totient is φ = 310816512.

The previous prime is 821325707. The next prime is 821325779. The reversal of 821325730 is 37523128.

It is a junction number, because it is equal to n+sod(n) for n = 821325692 and 821325701.

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, 161466 + ... + 166474.

It is an arithmetic number, because the mean of its divisors is an integer number (48697200).

Almost surely, 2^821325730 is an apocalyptic number.

821325730 is a deficient number, since it is larger than the sum of its proper divisors (736984670).

821325730 is a wasteful number, since it uses less digits than its factorization.

821325730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5898.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 821325730 is about 28658.7810278107. The cubic root of 821325730 is about 936.4943095152.

Adding to 821325730 its reverse (37523128), we get a palindrome (858848858).

The spelling of 821325730 in words is "eight hundred twenty-one million, three hundred twenty-five thousand, seven hundred thirty".