21013103504000 has 512 divisors, whose sum is σ = 60236721792000. Its totient is φ = 7235975577600.

The previous prime is 21013103503933. The next prime is 21013103504011. The reversal of 21013103504000 is 40530131012.

21013103504000 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149801897 + ... + 149942103.

It is an arithmetic number, because the mean of its divisors is an integer number (117649847250).

Almost surely, 2^{21013103504000} is an apocalyptic number.

21013103504000 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 21013103504000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30118360896000).

21013103504000 is an abundant number, since it is smaller than the sum of its proper divisors (39223618288000).

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

21013103504000 is a wasteful number, since it uses less digits than its factorization.

21013103504000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140301 (or 140279 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21013103504000 its reverse (40530131012), we get a palindrome (21053633635012).

The spelling of 21013103504000 in words is "twenty-one trillion, thirteen billion, one hundred three million, five hundred four thousand".