821427315 has 32 divisors (see below), whose sum is σ = 1327622400. Its totient is φ = 433670784.

The previous prime is 821427289. The next prime is 821427371. The reversal of 821427315 is 513724128.

It is not a de Polignac number, because 821427315 - 2⁹ = 821426803 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1043352 + ... + 1044138.

It is an arithmetic number, because the mean of its divisors is an integer number (41488200).

Almost surely, 2^821427315 is an apocalyptic number.

821427315 is a deficient number, since it is larger than the sum of its proper divisors (506195085).

821427315 is a wasteful number, since it uses less digits than its factorization.

821427315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411.

The product of its digits is 13440, while the sum is 33.

The square root of 821427315 is about 28660.5532919377. The cubic root of 821427315 is about 936.5329177673.

The spelling of 821427315 in words is "eight hundred twenty-one million, four hundred twenty-seven thousand, three hundred fifteen".