2181789012 has 48 divisors (see below), whose sum is σ = 5485679360. Its totient is φ = 670923648.

The previous prime is 2181789011. The next prime is 2181789041. The reversal of 2181789012 is 2109871812.

It is a super-2 number, since 2×2181789012² = 9520406585767872288, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181789011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368814 + ... + 374682.

Almost surely, 2^2181789012 is an apocalyptic number.

It is an amenable number.

2181789012 is an abundant number, since it is smaller than the sum of its proper divisors (3303890348).

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

2181789012 is a wasteful number, since it uses less digits than its factorization.

2181789012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8270 counting only the distinct ones).

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

The square root of 2181789012 is about 46709.6244043987. The cubic root of 2181789012 is about 1296.9928543959.

The spelling of 2181789012 in words is "two billion, one hundred eighty-one million, seven hundred eighty-nine thousand, twelve".