2111729880 has 128 divisors (see below), whose sum is σ = 6951510720. Its totient is φ = 509982720.

The previous prime is 2111729857. The next prime is 2111729891. The reversal of 2111729880 is 889271112.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69910 + ... + 95450.

Almost surely, 2^2111729880 is an apocalyptic number.

2111729880 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 2111729880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3475755360).

2111729880 is an abundant number, since it is smaller than the sum of its proper divisors (4839780840).

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

2111729880 is a wasteful number, since it uses less digits than its factorization.

2111729880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25621 (or 25617 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 39.

The square root of 2111729880 is about 45953.5622123030. The cubic root of 2111729880 is about 1282.9590314861.

The spelling of 2111729880 in words is "two billion, one hundred eleven million, seven hundred twenty-nine thousand, eight hundred eighty".