2021686575813 has 12 divisors (see below), whose sum is σ = 2920389096300. Its totient is φ = 1347710210496.

The previous prime is 2021686575809. The next prime is 2021686575823. The reversal of 2021686575813 is 3185756861202.

2021686575813 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 6 + 8 + 6 + 57 + 581 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1003559161284 + 1018127414529 = 1001778^2 + 1009023^2 .

It is not a de Polignac number, because 2021686575813 - 2² = 2021686575809 is a prime.

It is a super-2 number, since 2×2021686575813² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2021686575813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021686575823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6578088 + ... + 6878561.

It is an arithmetic number, because the mean of its divisors is an integer number (243365758025).

Almost surely, 2^{2021686575813} is an apocalyptic number.

It is an amenable number.

2021686575813 is a deficient number, since it is larger than the sum of its proper divisors (898702520487).

2021686575813 is a wasteful number, since it uses less digits than its factorization.

2021686575813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13473348 (or 13473345 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 2021686575813 in words is "two trillion, twenty-one billion, six hundred eighty-six million, five hundred seventy-five thousand, eight hundred thirteen".