21310343442440 has 96 divisors (see below), whose sum is σ = 51922170417600. Its totient is φ = 7868153928960.

The previous prime is 21310343442373. The next prime is 21310343442463. The reversal of 21310343442440 is 4424434301312.

It is a self number, because there is not a number n which added to its sum of digits gives 21310343442440.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362570255 + ... + 362629025.

It is an arithmetic number, because the mean of its divisors is an integer number (540855941850).

Almost surely, 2^{21310343442440} is an apocalyptic number.

21310343442440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310343442440 is an abundant number, since it is smaller than the sum of its proper divisors (30611826975160).

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

21310343442440 is a wasteful number, since it uses less digits than its factorization.

21310343442440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112447 (or 112430 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21310343442440 its reverse (4424434301312), we get a palindrome (25734777743752).

The spelling of 21310343442440 in words is "twenty-one trillion, three hundred ten billion, three hundred forty-three million, four hundred forty-two thousand, four hundred forty".