21341821288440 has 64 divisors (see below), whose sum is σ = 64902525040800. Its totient is φ = 5613191350272.

The previous prime is 21341821288433. The next prime is 21341821288441. The reversal of 21341821288440 is 4488212814312.

It is a self number, because there is not a number n which added to its sum of digits gives 21341821288440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341821288441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1218131725 + ... + 1218149244.

Almost surely, 2^{21341821288440} is an apocalyptic number.

21341821288440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21341821288440 is an abundant number, since it is smaller than the sum of its proper divisors (43560703752360).

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

21341821288440 is a wasteful number, since it uses less digits than its factorization.

21341821288440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2436281056 (or 2436281052 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 48.

The spelling of 21341821288440 in words is "twenty-one trillion, three hundred forty-one billion, eight hundred twenty-one million, two hundred eighty-eight thousand, four hundred forty".