20421359660064 has 96 divisors (see below), whose sum is σ = 61919309825856. Its totient is φ = 5824273694720.

The previous prime is 20421359660041. The next prime is 20421359660077. The reversal of 20421359660064 is 46006695312402.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 20421359659995 and 20421359660022.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 568758777 + ... + 568794680.

It is an arithmetic number, because the mean of its divisors is an integer number (644992810686).

Almost surely, 2^{20421359660064} is an apocalyptic number.

20421359660064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20421359660064 is an abundant number, since it is smaller than the sum of its proper divisors (41497950165792).

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

20421359660064 is a wasteful number, since it uses less digits than its factorization.

20421359660064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137553498 (or 1137553490 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 20421359660064 in words is "twenty trillion, four hundred twenty-one billion, three hundred fifty-nine million, six hundred sixty thousand, sixty-four".