21103404213320 has 384 divisors, whose sum is σ = 57543967486080. Its totient is φ = 6902258688000.

The previous prime is 21103404213299. The next prime is 21103404213349. The reversal of 21103404213320 is 2331240430112.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 21103404213320.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 485325980 + ... + 485369460.

It is an arithmetic number, because the mean of its divisors is an integer number (149854081995).

Almost surely, 2^{21103404213320} is an apocalyptic number.

21103404213320 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 21103404213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28771983743040).

21103404213320 is an abundant number, since it is smaller than the sum of its proper divisors (36440563272760).

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

21103404213320 is a wasteful number, since it uses less digits than its factorization.

21103404213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43697 (or 43680 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21103404213320 its reverse (2331240430112), we get a palindrome (23434644643432).

The spelling of 21103404213320 in words is "twenty-one trillion, one hundred three billion, four hundred four million, two hundred thirteen thousand, three hundred twenty".