2108217920 has 56 divisors (see below), whose sum is σ = 5027517504. Its totient is φ = 842057216.

The previous prime is 2108217893. The next prime is 2108217971. The reversal of 2108217920 is 297128012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233327 + ... + 242193.

Almost surely, 2^2108217920 is an apocalyptic number.

2108217920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2108217920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2513758752).

2108217920 is an abundant number, since it is smaller than the sum of its proper divisors (2919299584).

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

2108217920 is an equidigital number, since it uses as much as digits as its factorization.

2108217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9627 (or 9617 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 2108217920 is about 45915.3342577401. The cubic root of 2108217920 is about 1282.2474188690.

The spelling of 2108217920 in words is "two billion, one hundred eight million, two hundred seventeen thousand, nine hundred twenty".