21244203445240 has 32 divisors (see below), whose sum is σ = 47871771665760. Its totient is φ = 8484825571200.

The previous prime is 21244203445229. The next prime is 21244203445249. The reversal of 21244203445240 is 4254430244212.

It is a self number, because there is not a number n which added to its sum of digits gives 21244203445240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244203445249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401717196 + ... + 401770075.

It is an arithmetic number, because the mean of its divisors is an integer number (1495992864555).

Almost surely, 2^{21244203445240} is an apocalyptic number.

21244203445240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21244203445240 is an abundant number, since it is smaller than the sum of its proper divisors (26627568220520).

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

21244203445240 is a wasteful number, since it uses less digits than its factorization.

21244203445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803487943 (or 803487939 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 37.

Adding to 21244203445240 its reverse (4254430244212), we get a palindrome (25498633689452).

The spelling of 21244203445240 in words is "twenty-one trillion, two hundred forty-four billion, two hundred three million, four hundred forty-five thousand, two hundred forty".