821244906409 has 8 divisors (see below), whose sum is σ = 825910668000. Its totient is φ = 816580009632.

The previous prime is 821244906403. The next prime is 821244906479. The reversal of 821244906409 is 904609442128.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821244906409 - 2³ = 821244906401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821244906401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1738462 + ... + 2159800.

It is an arithmetic number, because the mean of its divisors is an integer number (103238833500).

Almost surely, 2^821244906409 is an apocalyptic number.

It is an amenable number.

821244906409 is a deficient number, since it is larger than the sum of its proper divisors (4665761591).

821244906409 is a wasteful number, since it uses less digits than its factorization.

821244906409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432407.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 821244906409 in words is "eight hundred twenty-one billion, two hundred forty-four million, nine hundred six thousand, four hundred nine".