20321231100000 has 144 divisors (see below), whose sum is σ = 66674773072656. Its totient is φ = 5418994880000.

The previous prime is 20321231099951. The next prime is 20321231100047. The reversal of 20321231100000 is 113212302.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33568719 + ... + 34168718.

It is an arithmetic number, because the mean of its divisors is an integer number (463019257449).

Almost surely, 2^{20321231100000} is an apocalyptic number.

20321231100000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321231100000 is an abundant number, since it is smaller than the sum of its proper divisors (46353541972656).

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

20321231100000 is an frugal number, since it uses more digits than its factorization.

20321231100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67737475 (or 67737447 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20321231100000 its reverse (113212302), we get a palindrome (20321344312302).

The spelling of 20321231100000 in words is "twenty trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred thousand".