2021685221844 has 36 divisors (see below), whose sum is σ = 5140972016544. Its totient is φ = 669859772112.

The previous prime is 2021685221837. The next prime is 2021685221909. The reversal of 2021685221844 is 4481225861202.

It is a happy number.

2021685221844 is a `hidden beast` number, since 2 + 0 + 21 + 68 + 522 + 1 + 8 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×2021685221844² (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 2021685221844.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168131482 + ... + 168143505.

Almost surely, 2^{2021685221844} is an apocalyptic number.

It is an amenable number.

2021685221844 is an abundant number, since it is smaller than the sum of its proper divisors (3119286794700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021685221844 is a wasteful number, since it uses less digits than its factorization.

2021685221844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336275164 (or 336275159 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The spelling of 2021685221844 in words is "two trillion, twenty-one billion, six hundred eighty-five million, two hundred twenty-one thousand, eight hundred forty-four".