21043033010340 has 192 divisors, whose sum is σ = 65106373570560. Its totient is φ = 5035541621760.

The previous prime is 21043033010323. The next prime is 21043033010357. The reversal of 21043033010340 is 4301033034012.

It is an interprime number because it is at equal distance from previous prime (21043033010323) and next prime (21043033010357).

It is a self number, because there is not a number n which added to its sum of digits gives 21043033010340.

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, 223998619 + ... + 224092541.

It is an arithmetic number, because the mean of its divisors is an integer number (339095695680).

Almost surely, 2^{21043033010340} is an apocalyptic number.

21043033010340 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 21043033010340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32553186785280).

21043033010340 is an abundant number, since it is smaller than the sum of its proper divisors (44063340560220).

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

21043033010340 is a wasteful number, since it uses less digits than its factorization.

21043033010340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98322 (or 98320 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21043033010340 its reverse (4301033034012), we get a palindrome (25344066044352).

The spelling of 21043033010340 in words is "twenty-one trillion, forty-three billion, thirty-three million, ten thousand, three hundred forty".