2101723643 has 2 divisors, whose sum is σ = 2101723644. Its totient is φ = 2101723642.

The previous prime is 2101723619. The next prime is 2101723711. The reversal of 2101723643 is 3463271012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2101723643 - 2⁶ = 2101723579 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101723843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050861821 + 1050861822.

It is an arithmetic number, because the mean of its divisors is an integer number (1050861822).

Almost surely, 2^2101723643 is an apocalyptic number.

2101723643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101723643 is an equidigital number, since it uses as much as digits as its factorization.

2101723643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 2101723643 is about 45844.5595790820. The cubic root of 2101723643 is about 1280.9294281137.

Adding to 2101723643 its reverse (3463271012), we get a palindrome (5564994655).

The spelling of 2101723643 in words is "two billion, one hundred one million, seven hundred twenty-three thousand, six hundred forty-three".