2117591709420 has 48 divisors (see below), whose sum is σ = 6468280132608. Its totient is φ = 513355565760.

The previous prime is 2117591709371. The next prime is 2117591709421. The reversal of 2117591709420 is 249071957112.

It is a self number, because there is not a number n which added to its sum of digits gives 2117591709420.

It is not an unprimeable number, because it can be changed into a prime (2117591709421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1604235484 + ... + 1604236803.

It is an arithmetic number, because the mean of its divisors is an integer number (134755836096).

Almost surely, 2^{2117591709420} is an apocalyptic number.

2117591709420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2117591709420 is an abundant number, since it is smaller than the sum of its proper divisors (4350688423188).

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

2117591709420 is a wasteful number, since it uses less digits than its factorization.

2117591709420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208472310 (or 3208472308 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 2117591709420 in words is "two trillion, one hundred seventeen billion, five hundred ninety-one million, seven hundred nine thousand, four hundred twenty".