21041241320 has 128 divisors (see below), whose sum is σ = 53514777600. Its totient is φ = 7376486400.

The previous prime is 21041241293. The next prime is 21041241341. The reversal of 21041241320 is 2314214012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21041241292 and 21041241301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3775496 + ... + 3781064.

It is an arithmetic number, because the mean of its divisors is an integer number (418084200).

Almost surely, 2^21041241320 is an apocalyptic number.

21041241320 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 21041241320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26757388800).

21041241320 is an abundant number, since it is smaller than the sum of its proper divisors (32473536280).

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

21041241320 is a wasteful number, since it uses less digits than its factorization.

21041241320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899 (or 5895 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21041241320 its reverse (2314214012), we get a palindrome (23355455332).

The spelling of 21041241320 in words is "twenty-one billion, forty-one million, two hundred forty-one thousand, three hundred twenty".