21234541100020 has 24 divisors (see below), whose sum is σ = 44592622951968. Its totient is φ = 8493799936800.

The previous prime is 21234541099957. The next prime is 21234541100033. The reversal of 21234541100020 is 2000114543212.

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 7 ways as a sum of consecutive naturals, for example, 19159635 + ... + 20237605.

It is an arithmetic number, because the mean of its divisors is an integer number (1858025956332).

Almost surely, 2^{21234541100020} is an apocalyptic number.

21234541100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234541100020 is an abundant number, since it is smaller than the sum of its proper divisors (23358081851948).

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

21234541100020 is a wasteful number, since it uses less digits than its factorization.

21234541100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062911 (or 2062909 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21234541100020 its reverse (2000114543212), we get a palindrome (23234655643232).

The spelling of 21234541100020 in words is "twenty-one trillion, two hundred thirty-four billion, five hundred forty-one million, one hundred thousand, twenty".