21341545004240 has 20 divisors (see below), whose sum is σ = 49619092135044. Its totient is φ = 8536618001664.

The previous prime is 21341545004239. The next prime is 21341545004243. The reversal of 21341545004240 is 4240054514312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11820889175104 + 9520655829136 = 3438152^2 + 3085556^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 21341545004240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341545004243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133384656197 + ... + 133384656356.

Almost surely, 2^{21341545004240} is an apocalyptic number.

21341545004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21341545004240 is an abundant number, since it is smaller than the sum of its proper divisors (28277547130804).

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

21341545004240 is a wasteful number, since it uses less digits than its factorization.

21341545004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266769312566 (or 266769312560 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21341545004240 its reverse (4240054514312), we get a palindrome (25581599518552).

The spelling of 21341545004240 in words is "twenty-one trillion, three hundred forty-one billion, five hundred forty-five million, four thousand, two hundred forty".