2133780621 has 16 divisors (see below), whose sum is σ = 3281308800. Its totient is φ = 1208115648.

The previous prime is 2133780611. The next prime is 2133780637. The reversal of 2133780621 is 1260873312.

It is not a de Polignac number, because 2133780621 - 2¹⁰ = 2133779597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133780601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 463806 + ... + 468383.

It is an arithmetic number, because the mean of its divisors is an integer number (205081800).

Almost surely, 2^2133780621 is an apocalyptic number.

2133780621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2133780621 is a deficient number, since it is larger than the sum of its proper divisors (1147528179).

2133780621 is a wasteful number, since it uses less digits than its factorization.

2133780621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932308.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 2133780621 is about 46192.8633124209. The cubic root of 2133780621 is about 1287.4091422483.

The spelling of 2133780621 in words is "two billion, one hundred thirty-three million, seven hundred eighty thousand, six hundred twenty-one".