2184131021 has 2 divisors, whose sum is σ = 2184131022. Its totient is φ = 2184131020.

The previous prime is 2184131003. The next prime is 2184131023. The reversal of 2184131021 is 1201314812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2170255396 + 13875625 = 46586^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2184131021 - 2³⁰ = 1110389197 is a prime.

Together with 2184131023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2184131023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092065510 + 1092065511.

It is an arithmetic number, because the mean of its divisors is an integer number (1092065511).

Almost surely, 2^2184131021 is an apocalyptic number.

It is an amenable number.

2184131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2184131021 is an equidigital number, since it uses as much as digits as its factorization.

2184131021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2184131021 is about 46734.6875564607. The cubic root of 2184131021 is about 1297.4567676785.

Adding to 2184131021 its reverse (1201314812), we get a palindrome (3385445833).

The spelling of 2184131021 in words is "two billion, one hundred eighty-four million, one hundred thirty-one thousand, twenty-one".