821098947 has 8 divisors (see below), whose sum is σ = 1095703056. Its totient is φ = 546947072.

The previous prime is 821098939. The next prime is 821098973. The reversal of 821098947 is 749890128.

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 821098947 - 2³ = 821098939 is a prime.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 821098896 and 821098905.

It is not an unprimeable number, because it can be changed into a prime (821098907) 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, 108798 + ... + 116099.

It is an arithmetic number, because the mean of its divisors is an integer number (136962882).

Almost surely, 2^821098947 is an apocalyptic number.

821098947 is a deficient number, since it is larger than the sum of its proper divisors (274604109).

821098947 is a wasteful number, since it uses less digits than its factorization.

821098947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226117.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 821098947 is about 28654.8241488235. The cubic root of 821098947 is about 936.4081071996.

The spelling of 821098947 in words is "eight hundred twenty-one million, ninety-eight thousand, nine hundred forty-seven".