2109205560 has 256 divisors, whose sum is σ = 8009072640. Its totient is φ = 431608320.

The previous prime is 2109205541. The next prime is 2109205607. The reversal of 2109205560 is 655029012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 617377 + ... + 620783.

It is an arithmetic number, because the mean of its divisors is an integer number (31285440).

Almost surely, 2^2109205560 is an apocalyptic number.

2109205560 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 2109205560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4004536320).

2109205560 is an abundant number, since it is smaller than the sum of its proper divisors (5899867080).

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

2109205560 is a wasteful number, since it uses less digits than its factorization.

2109205560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 3502 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 2109205560 is about 45926.0880110640. The cubic root of 2109205560 is about 1282.4476197311.

The spelling of 2109205560 in words is "two billion, one hundred nine million, two hundred five thousand, five hundred sixty".