2021332756644 has 48 divisors (see below), whose sum is σ = 5246593262400. Its totient is φ = 672993180288.

The previous prime is 2021332756589. The next prime is 2021332756673. The reversal of 2021332756644 is 4466572331202.

2021332756644 is a `hidden beast` number, since 2 + 0 + 2 + 13 + 32 + 7 + 566 + 44 = 666.

It is a super-2 number, since 2×2021332756644² (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 2021332756644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10801317 + ... + 10986860.

It is an arithmetic number, because the mean of its divisors is an integer number (109304026300).

Almost surely, 2^{2021332756644} is an apocalyptic number.

It is an amenable number.

2021332756644 is an abundant number, since it is smaller than the sum of its proper divisors (3225260505756).

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

2021332756644 is a wasteful number, since it uses less digits than its factorization.

2021332756644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21789049 (or 21789041 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 45.

The spelling of 2021332756644 in words is "two trillion, twenty-one billion, three hundred thirty-two million, seven hundred fifty-six thousand, six hundred forty-four".