821302442 has 4 divisors (see below), whose sum is σ = 1231953666. Its totient is φ = 410651220.

The previous prime is 821302441. The next prime is 821302457. The reversal of 821302442 is 244203128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 794168761 + 27133681 = 28181^2 + 5209^2 .

It is not an unprimeable number, because it can be changed into a prime (821302441) 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 as a sum of consecutive naturals, namely, 205325609 + ... + 205325612.

Almost surely, 2^821302442 is an apocalyptic number.

821302442 is a deficient number, since it is larger than the sum of its proper divisors (410651224).

821302442 is a wasteful number, since it uses less digits than its factorization.

821302442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410651223.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 821302442 is about 28658.3747271195. The cubic root of 821302442 is about 936.4854582622.

The spelling of 821302442 in words is "eight hundred twenty-one million, three hundred two thousand, four hundred forty-two".