821142722 has 8 divisors (see below), whose sum is σ = 1296541200. Its totient is φ = 388962324.

The previous prime is 821142719. The next prime is 821142731. The reversal of 821142722 is 227241128.

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 10804472 + ... + 10804547.

It is an arithmetic number, because the mean of its divisors is an integer number (162067650).

Almost surely, 2^821142722 is an apocalyptic number.

821142722 is a deficient number, since it is larger than the sum of its proper divisors (475398478).

821142722 is a wasteful number, since it uses less digits than its factorization.

821142722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21609040.

The product of its digits is 3584, while the sum is 29.

The square root of 821142722 is about 28655.5879716330. The cubic root of 821142722 is about 936.4247477180.

The spelling of 821142722 in words is "eight hundred twenty-one million, one hundred forty-two thousand, seven hundred twenty-two".