2101723345 has 16 divisors (see below), whose sum is σ = 2735561808. Its totient is φ = 1543874560.

The previous prime is 2101723339. The next prime is 2101723367. The reversal of 2101723345 is 5433271012.

It can be written as a sum of positive squares in 8 ways, for example, as 320123664 + 1781599681 = 17892^2 + 42209^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2101723345 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298054 + ... + 305023.

It is an arithmetic number, because the mean of its divisors is an integer number (170972613).

Almost surely, 2^2101723345 is an apocalyptic number.

It is an amenable number.

2101723345 is a deficient number, since it is larger than the sum of its proper divisors (633838463).

2101723345 is a wasteful number, since it uses less digits than its factorization.

2101723345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603140.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 2101723345 is about 45844.5563289689. The cubic root of 2101723345 is about 1280.9293675734.

Adding to 2101723345 its reverse (5433271012), we get a palindrome (7534994357).

The spelling of 2101723345 in words is "two billion, one hundred one million, seven hundred twenty-three thousand, three hundred forty-five".