821082450290 has 16 divisors (see below), whose sum is σ = 1478105458200. Its totient is φ = 328398080640.

The previous prime is 821082450277. The next prime is 821082450319. The reversal of 821082450290 is 92054280128.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 374148752329 + 446933697961 = 611677^2 + 668531^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4263515 + ... + 4451934.

Almost surely, 2^821082450290 is an apocalyptic number.

821082450290 is a deficient number, since it is larger than the sum of its proper divisors (657023007910).

821082450290 is a wasteful number, since it uses less digits than its factorization.

821082450290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8724877.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 821082450290 in words is "eight hundred twenty-one billion, eighty-two million, four hundred fifty thousand, two hundred ninety".