20721674284689 has 64 divisors (see below), whose sum is σ = 32111446118400. Its totient is φ = 11640847730688.

The previous prime is 20721674284603. The next prime is 20721674284693. The reversal of 20721674284689 is 98648247612702.

It is not a de Polignac number, because 20721674284689 - 2⁷ = 20721674284561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20721674280689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2812002597 + ... + 2812009965.

It is an arithmetic number, because the mean of its divisors is an integer number (501741345600).

Almost surely, 2^{20721674284689} is an apocalyptic number.

It is an amenable number.

20721674284689 is a deficient number, since it is larger than the sum of its proper divisors (11389771833711).

20721674284689 is a wasteful number, since it uses less digits than its factorization.

20721674284689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11182.

The product of its (nonzero) digits is 130056192, while the sum is 66.

The spelling of 20721674284689 in words is "twenty trillion, seven hundred twenty-one billion, six hundred seventy-four million, two hundred eighty-four thousand, six hundred eighty-nine".