21041340240 has 320 divisors, whose sum is σ = 71966822400. Its totient is φ = 5061906432.

The previous prime is 21041340233. The next prime is 21041340323. The reversal of 21041340240 is 4204314012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46042092 + ... + 46042548.

It is an arithmetic number, because the mean of its divisors is an integer number (224896320).

Almost surely, 2^21041340240 is an apocalyptic number.

21041340240 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 21041340240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35983411200).

21041340240 is an abundant number, since it is smaller than the sum of its proper divisors (50925482160).

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

21041340240 is a wasteful number, since it uses less digits than its factorization.

21041340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21041340240 its reverse (4204314012), we get a palindrome (25245654252).

The spelling of 21041340240 in words is "twenty-one billion, forty-one million, three hundred forty thousand, two hundred forty".