821313087 has 32 divisors (see below), whose sum is σ = 1289203200. Its totient is φ = 455269248.

The previous prime is 821313083. The next prime is 821313121. The reversal of 821313087 is 780313128.

It is not a de Polignac number, because 821313087 - 2² = 821313083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821313083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293089 + ... + 295877.

It is an arithmetic number, because the mean of its divisors is an integer number (40287600).

Almost surely, 2^821313087 is an apocalyptic number.

821313087 is a deficient number, since it is larger than the sum of its proper divisors (467890113).

821313087 is a wasteful number, since it uses less digits than its factorization.

821313087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 821313087 is about 28658.5604488432. The cubic root of 821313087 is about 936.4895042117.

The spelling of 821313087 in words is "eight hundred twenty-one million, three hundred thirteen thousand, eighty-seven".