821354273842 has 8 divisors (see below), whose sum is σ = 1232035996716. Its totient is φ = 410675608272.

The previous prime is 821354273819. The next prime is 821354273881. The reversal of 821354273842 is 248372453128.

It can be written as a sum of positive squares in 2 ways, for example, as 702480335881 + 118873937961 = 838141^2 + 344781^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105108 + ... + 1285984.

Almost surely, 2^821354273842 is an apocalyptic number.

821354273842 is a deficient number, since it is larger than the sum of its proper divisors (410681722874).

821354273842 is a wasteful number, since it uses less digits than its factorization.

821354273842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528652.

The product of its digits is 2580480, while the sum is 49.

The spelling of 821354273842 in words is "eight hundred twenty-one billion, three hundred fifty-four million, two hundred seventy-three thousand, eight hundred forty-two".