21113242653440 has 72 divisors (see below), whose sum is σ = 57797501788320. Its totient is φ = 7238826049536.

The previous prime is 21113242653439. The next prime is 21113242653443. The reversal of 21113242653440 is 4435624231112.

It is a junction number, because it is equal to n+sod(n) for n = 21113242653394 and 21113242653403.

It is not an unprimeable number, because it can be changed into a prime (21113242653443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1178185385 + ... + 1178203304.

Almost surely, 2^{21113242653440} is an apocalyptic number.

21113242653440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113242653440 is an abundant number, since it is smaller than the sum of its proper divisors (36684259134880).

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

21113242653440 is an equidigital number, since it uses as much as digits as its factorization.

21113242653440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356388717 (or 2356388703 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21113242653440 its reverse (4435624231112), we get a palindrome (25548866884552).

The spelling of 21113242653440 in words is "twenty-one trillion, one hundred thirteen billion, two hundred forty-two million, six hundred fifty-three thousand, four hundred forty".