21355301513440 has 48 divisors (see below), whose sum is σ = 52191620520480. Its totient is φ = 8247564720640.

The previous prime is 21355301513423. The next prime is 21355301513459. The reversal of 21355301513440 is 4431510355312.

It is a self number, because there is not a number n which added to its sum of digits gives 21355301513440.

It is a congruent number.

It is an unprimeable number.

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, 2301213196 + ... + 2301222475.

It is an arithmetic number, because the mean of its divisors is an integer number (1087325427510).

Almost surely, 2^{21355301513440} is an apocalyptic number.

21355301513440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355301513440 is an abundant number, since it is smaller than the sum of its proper divisors (30836319007040).

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

21355301513440 is a wasteful number, since it uses less digits than its factorization.

21355301513440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602435715 (or 4602435707 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 21355301513440 its reverse (4431510355312), we get a palindrome (25786811868752).

The spelling of 21355301513440 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred one million, five hundred thirteen thousand, four hundred forty".