2178231011 has 4 divisors (see below), whose sum is σ = 2376252024. Its totient is φ = 1980210000.

The previous prime is 2178230987. The next prime is 2178231061. The reversal of 2178231011 is 1101328712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2178231011 - 2¹⁴ = 2178214627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2178231061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99010490 + ... + 99010511.

It is an arithmetic number, because the mean of its divisors is an integer number (594063006).

Almost surely, 2^2178231011 is an apocalyptic number.

2178231011 is a deficient number, since it is larger than the sum of its proper divisors (198021013).

2178231011 is a wasteful number, since it uses less digits than its factorization.

2178231011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198021012.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 2178231011 is about 46671.5224842730. The cubic root of 2178231011 is about 1296.2874374755.

Adding to 2178231011 its reverse (1101328712), we get a palindrome (3279559723).

The spelling of 2178231011 in words is "two billion, one hundred seventy-eight million, two hundred thirty-one thousand, eleven".