821315930 has 16 divisors (see below), whose sum is σ = 1499192064. Its totient is φ = 323898960.

The previous prime is 821315921. The next prime is 821315933. The reversal of 821315930 is 39513128.

It is not an unprimeable number, because it can be changed into a prime (821315933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577682 + ... + 579101.

It is an arithmetic number, because the mean of its divisors is an integer number (93699504).

Almost surely, 2^821315930 is an apocalyptic number.

821315930 is a deficient number, since it is larger than the sum of its proper divisors (677876134).

821315930 is a wasteful number, since it uses less digits than its factorization.

821315930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156861.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 821315930 is about 28658.6100500356. The cubic root of 821315930 is about 936.4905847727.

The spelling of 821315930 in words is "eight hundred twenty-one million, three hundred fifteen thousand, nine hundred thirty".