2108749221 has 10 divisors (see below), whose sum is σ = 3150106982. Its totient is φ = 1405832760.

The previous prime is 2108749217. The next prime is 2108749243. The reversal of 2108749221 is 1229478012.

It can be written as a sum of positive squares in only one way, i.e., 2065702500 + 43046721 = 45450^2 + 6561^2 .

It is not a de Polignac number, because 2108749221 - 2² = 2108749217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108749271) 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 in 9 ways as a sum of consecutive naturals, for example, 13016890 + ... + 13017051.

Almost surely, 2^2108749221 is an apocalyptic number.

It is an amenable number.

2108749221 is a deficient number, since it is larger than the sum of its proper divisors (1041357761).

2108749221 is an equidigital number, since it uses as much as digits as its factorization.

2108749221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26033953 (or 26033944 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2108749221 is about 45921.1195529900. The cubic root of 2108749221 is about 1282.3551247041.

The spelling of 2108749221 in words is "two billion, one hundred eight million, seven hundred forty-nine thousand, two hundred twenty-one".