13215402243440 has 40 divisors (see below), whose sum is σ = 30726813246480. Its totient is φ = 5285988333056.

The previous prime is 13215402243431. The next prime is 13215402243499. The reversal of 13215402243440 is 4434220451231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 13215402243440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216194 + ... + 5145633.

It is an arithmetic number, because the mean of its divisors is an integer number (768170331162).

Almost surely, 2^{13215402243440} is an apocalyptic number.

13215402243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13215402243440 is an abundant number, since it is smaller than the sum of its proper divisors (17511411003040).

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

13215402243440 is a wasteful number, since it uses less digits than its factorization.

13215402243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392649 (or 5392643 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 13215402243440 its reverse (4434220451231), we get a palindrome (17649622694671).

The spelling of 13215402243440 in words is "thirteen trillion, two hundred fifteen billion, four hundred two million, two hundred forty-three thousand, four hundred forty".