853833779021 has 16 divisors (see below), whose sum is σ = 917475761664. Its totient is φ = 791756826624.

The previous prime is 853833779011. The next prime is 853833779023. The reversal of 853833779021 is 120977338358.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853833779021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853833779023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 793235 + ... + 1528688.

It is an arithmetic number, because the mean of its divisors is an integer number (57342235104).

Almost surely, 2^853833779021 is an apocalyptic number.

It is an amenable number.

853833779021 is a deficient number, since it is larger than the sum of its proper divisors (63641982643).

853833779021 is a wasteful number, since it uses less digits than its factorization.

853833779021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322260.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 853833779021 in words is "eight hundred fifty-three billion, eight hundred thirty-three million, seven hundred seventy-nine thousand, twenty-one".