21123300230020 has 24 divisors (see below), whose sum is σ = 44359493131800. Its totient is φ = 8449212920832.

The previous prime is 21123300230009. The next prime is 21123300230027. The reversal of 21123300230020 is 2003200332112.

It can be written as a sum of positive squares in 4 ways, for example, as 7933866490944 + 13189433739076 = 2816712^2 + 3631726^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21123300230020.

It is not an unprimeable number, because it can be changed into a prime (21123300230027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5072365 + ... + 8244724.

It is an arithmetic number, because the mean of its divisors is an integer number (1848312213825).

Almost surely, 2^{21123300230020} is an apocalyptic number.

21123300230020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123300230020 is an abundant number, since it is smaller than the sum of its proper divisors (23236192901780).

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

21123300230020 is a wasteful number, since it uses less digits than its factorization.

21123300230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13396407 (or 13396405 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21123300230020 its reverse (2003200332112), we get a palindrome (23126500562132).

The spelling of 21123300230020 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred million, two hundred thirty thousand, twenty".