21250330516540 has 48 divisors (see below), whose sum is σ = 44876324414880. Its totient is φ = 8452395902720.

The previous prime is 21250330516537. The next prime is 21250330516553. The reversal of 21250330516540 is 4561503305212.

It is a self number, because there is not a number n which added to its sum of digits gives 21250330516540.

It is a congruent number.

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, 164232270 + ... + 164361610.

It is an arithmetic number, because the mean of its divisors is an integer number (934923425310).

Almost surely, 2^{21250330516540} is an apocalyptic number.

21250330516540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21250330516540 is an abundant number, since it is smaller than the sum of its proper divisors (23625993898340).

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

21250330516540 is a wasteful number, since it uses less digits than its factorization.

21250330516540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175422 (or 175420 counting only the distinct ones).

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

The spelling of 21250330516540 in words is "twenty-one trillion, two hundred fifty billion, three hundred thirty million, five hundred sixteen thousand, five hundred forty".