2145223123 has 2 divisors, whose sum is σ = 2145223124. Its totient is φ = 2145223122.

The previous prime is 2145223121. The next prime is 2145223151. The reversal of 2145223123 is 3213225412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145223123 - 2¹ = 2145223121 is a prime.

Together with 2145223121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2145223121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072611561 + 1072611562.

It is an arithmetic number, because the mean of its divisors is an integer number (1072611562).

Almost surely, 2^2145223123 is an apocalyptic number.

2145223123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145223123 is an equidigital number, since it uses as much as digits as its factorization.

2145223123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 2145223123 is about 46316.5534447459. The cubic root of 2145223123 is about 1289.7063055531.

Adding to 2145223123 its reverse (3213225412), we get a palindrome (5358448535).

The spelling of 2145223123 in words is "two billion, one hundred forty-five million, two hundred twenty-three thousand, one hundred twenty-three".