21165201066140 has 96 divisors (see below), whose sum is σ = 48514706170560. Its totient is φ = 7725721337856.

The previous prime is 21165201066071. The next prime is 21165201066151. The reversal of 21165201066140 is 4166010256112.

It is a self number, because there is not a number n which added to its sum of digits gives 21165201066140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5762297 + ... + 8691056.

It is an arithmetic number, because the mean of its divisors is an integer number (505361522610).

Almost surely, 2^{21165201066140} is an apocalyptic number.

21165201066140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21165201066140 is an abundant number, since it is smaller than the sum of its proper divisors (27349505104420).

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

21165201066140 is a wasteful number, since it uses less digits than its factorization.

21165201066140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14453511 (or 14453509 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21165201066140 in words is "twenty-one trillion, one hundred sixty-five billion, two hundred one million, sixty-six thousand, one hundred forty".