821336145 has 32 divisors (see below), whose sum is σ = 1503007488. Its totient is φ = 375184128.

The previous prime is 821336129. The next prime is 821336171. The reversal of 821336145 is 541633128.

It is not a de Polignac number, because 821336145 - 2⁴ = 821336129 is a prime.

It is a super-2 number, since 2×821336145² = 1349186126166922050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207727 + ... + 211643.

It is an arithmetic number, because the mean of its divisors is an integer number (46968984).

Almost surely, 2^821336145 is an apocalyptic number.

It is an amenable number.

821336145 is a deficient number, since it is larger than the sum of its proper divisors (681671343).

821336145 is a wasteful number, since it uses less digits than its factorization.

821336145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929.

The product of its digits is 17280, while the sum is 33.

The square root of 821336145 is about 28658.9627341954. The cubic root of 821336145 is about 936.4982679719.

The spelling of 821336145 in words is "eight hundred twenty-one million, three hundred thirty-six thousand, one hundred forty-five".