21265528014440 has 64 divisors (see below), whose sum is σ = 47884005688320. Its totient is φ = 8499712320000.

The previous prime is 21265528014439. The next prime is 21265528014463. The reversal of 21265528014440 is 4441082556212.

It is a junction number, because it is equal to n+sod(n) for n = 21265528014391 and 21265528014400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376813025 + ... + 376869455.

It is an arithmetic number, because the mean of its divisors is an integer number (748187588880).

Almost surely, 2^{21265528014440} is an apocalyptic number.

21265528014440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21265528014440 is an abundant number, since it is smaller than the sum of its proper divisors (26618477673880).

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

21265528014440 is a wasteful number, since it uses less digits than its factorization.

21265528014440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63474 (or 63470 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 44.

The spelling of 21265528014440 in words is "twenty-one trillion, two hundred sixty-five billion, five hundred twenty-eight million, fourteen thousand, four hundred forty".