821197441 has 8 divisors (see below), whose sum is σ = 833616224.
Its totient is φ = 808859520.
The previous prime is 821197439. The next prime is 821197463. The reversal of 821197441 is 144791128.
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 821197441 - 21 = 821197439 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 821197441.
It is not an unprimeable number, because it can be changed into a prime (821197411) 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, 406 + ... + 40528.
It is an arithmetic number, because the mean of its divisors is an integer number (104202028).
Almost surely, 2821197441 is an apocalyptic number.
It is an amenable number.
821197441 is a deficient number, since it is larger than the sum of its proper divisors (12418783).
821197441 is a wasteful number, since it uses less digits than its factorization.
821197441 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 40431.
The product of its digits is 16128, while the sum is 37.
The square root of 821197441 is about 28656.5427258768.
The cubic root of 821197441 is about 936.4455476295.
The spelling of 821197441 in words is "eight hundred twenty-one million, one hundred ninety-seven thousand, four hundred forty-one".