2109807989440 has 448 divisors, whose sum is σ = 5914918563840. Its totient is φ = 711221575680.

The previous prime is 2109807989437. The next prime is 2109807989447. The reversal of 2109807989440 is 449897089012.

It is not an unprimeable number, because it can be changed into a prime (2109807989447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 137771224 + ... + 137786536.

Almost surely, 2^{2109807989440} is an apocalyptic number.

2109807989440 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 2109807989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2957459281920).

2109807989440 is an abundant number, since it is smaller than the sum of its proper divisors (3805110574400).

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

2109807989440 is a wasteful number, since it uses less digits than its factorization.

2109807989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15440 (or 15430 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 2109807989440 in words is "two trillion, one hundred nine billion, eight hundred seven million, nine hundred eighty-nine thousand, four hundred forty".