2100221305 has 48 divisors (see below), whose sum is σ = 3141158400. Its totient is φ = 1319894784.

The previous prime is 2100221303. The next prime is 2100221323. The reversal of 2100221305 is 5031220012.

It is not a de Polignac number, because 2100221305 - 2¹ = 2100221303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100221303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 880144 + ... + 882526.

It is an arithmetic number, because the mean of its divisors is an integer number (65440800).

Almost surely, 2^2100221305 is an apocalyptic number.

It is an amenable number.

2100221305 is a deficient number, since it is larger than the sum of its proper divisors (1040937095).

2100221305 is a wasteful number, since it uses less digits than its factorization.

2100221305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2100221305 is about 45828.1715214561. The cubic root of 2100221305 is about 1280.6241473077.

Adding to 2100221305 its reverse (5031220012), we get a palindrome (7131441317).

The spelling of 2100221305 in words is "two billion, one hundred million, two hundred twenty-one thousand, three hundred five".