821365332 has 12 divisors (see below), whose sum is σ = 1916519136. Its totient is φ = 273788440.

The previous prime is 821365301. The next prime is 821365339. The reversal of 821365332 is 233563128.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×821365332² = 1349282017222940448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 821365293 and 821365302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821365339) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 34223544 + ... + 34223567.

It is an arithmetic number, because the mean of its divisors is an integer number (159709928).

Almost surely, 2^821365332 is an apocalyptic number.

It is an amenable number.

821365332 is an abundant number, since it is smaller than the sum of its proper divisors (1095153804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821365332 is a wasteful number, since it uses less digits than its factorization.

821365332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68447118 (or 68447116 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 821365332 is about 28659.4719420997. The cubic root of 821365332 is about 936.5093609742.

The spelling of 821365332 in words is "eight hundred twenty-one million, three hundred sixty-five thousand, three hundred thirty-two".