21043123410000 has 400 divisors, whose sum is σ = 69415913597184. Its totient is φ = 5488893696000.

The previous prime is 21043123409993. The next prime is 21043123410037. The reversal of 21043123410000 is 1432134012.

It is a tau number, because it is divible by the number of its divisors (400).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3289526802 + ... + 3289533198.

Almost surely, 2^{21043123410000} is an apocalyptic number.

21043123410000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21043123410000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34707956798592).

21043123410000 is an abundant number, since it is smaller than the sum of its proper divisors (48372790187184).

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

21043123410000 is a wasteful number, since it uses less digits than its factorization.

21043123410000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8808 (or 8787 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21043123410000 its reverse (1432134012), we get a palindrome (21044555544012).

The spelling of 21043123410000 in words is "twenty-one trillion, forty-three billion, one hundred twenty-three million, four hundred ten thousand".