2129136720 has 80 divisors (see below), whose sum is σ = 6698886720. Its totient is φ = 559291392.

The previous prime is 2129136689. The next prime is 2129136731. The reversal of 2129136720 is 276319212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50125 + ... + 82284.

It is an arithmetic number, because the mean of its divisors is an integer number (83736084).

Almost surely, 2^2129136720 is an apocalyptic number.

2129136720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2129136720 is an abundant number, since it is smaller than the sum of its proper divisors (4569750000).

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

2129136720 is a wasteful number, since it uses less digits than its factorization.

2129136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132492 (or 132486 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 2129136720 is about 46142.5694993246. The cubic root of 2129136720 is about 1286.4745033550.

The spelling of 2129136720 in words is "two billion, one hundred twenty-nine million, one hundred thirty-six thousand, seven hundred twenty".