821513411830 has 16 divisors (see below), whose sum is σ = 1480714362144. Its totient is φ = 328163093440.

The previous prime is 821513411783. The next prime is 821513411837. The reversal of 821513411830 is 38114315128.

It is a self number, because there is not a number n which added to its sum of digits gives 821513411830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821513411837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55276111 + ... + 55290970.

It is an arithmetic number, because the mean of its divisors is an integer number (92544647634).

Almost surely, 2^821513411830 is an apocalyptic number.

821513411830 is a deficient number, since it is larger than the sum of its proper divisors (659200950314).

821513411830 is a wasteful number, since it uses less digits than its factorization.

821513411830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110567831.

The product of its (nonzero) digits is 23040, while the sum is 37.

Adding to 821513411830 its reverse (38114315128), we get a palindrome (859627726958).

The spelling of 821513411830 in words is "eight hundred twenty-one billion, five hundred thirteen million, four hundred eleven thousand, eight hundred thirty".