821231332 has 6 divisors (see below), whose sum is σ = 1437154838. Its totient is φ = 410615664.

The previous prime is 821231311. The next prime is 821231377. The reversal of 821231332 is 233132128.

It can be written as a sum of positive squares in only one way, i.e., 723932836 + 97298496 = 26906^2 + 9864^2 .

It is a junction number, because it is equal to n+sod(n) for n = 821231297 and 821231306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102653913 + ... + 102653920.

Almost surely, 2^821231332 is an apocalyptic number.

It is an amenable number.

821231332 is a deficient number, since it is larger than the sum of its proper divisors (615923506).

821231332 is a wasteful number, since it uses less digits than its factorization.

821231332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205307837 (or 205307835 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 821231332 is about 28657.1340507037. The cubic root of 821231332 is about 936.4584298905.

The spelling of 821231332 in words is "eight hundred twenty-one million, two hundred thirty-one thousand, three hundred thirty-two".