2123432261 has 2 divisors, whose sum is σ = 2123432262. Its totient is φ = 2123432260.

The previous prime is 2123432173. The next prime is 2123432263. The reversal of 2123432261 is 1622343212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1738056100 + 385376161 = 41690^2 + 19631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123432261 is a prime.

Together with 2123432263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123432261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123432263) 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 as a sum of consecutive naturals, namely, 1061716130 + 1061716131.

It is an arithmetic number, because the mean of its divisors is an integer number (1061716131).

Almost surely, 2^2123432261 is an apocalyptic number.

It is an amenable number.

2123432261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123432261 is an equidigital number, since it uses as much as digits as its factorization.

2123432261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 2123432261 is about 46080.7146320454. The cubic root of 2123432261 is about 1285.3245529634.

Adding to 2123432261 its reverse (1622343212), we get a palindrome (3745775473).

The spelling of 2123432261 in words is "two billion, one hundred twenty-three million, four hundred thirty-two thousand, two hundred sixty-one".