2101949660 has 24 divisors (see below), whose sum is σ = 4445856240. Its totient is φ = 834729984.

The previous prime is 2101949659. The next prime is 2101949677. The reversal of 2101949660 is 669491012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375269 + ... + 380828.

It is an arithmetic number, because the mean of its divisors is an integer number (185244010).

Almost surely, 2^2101949660 is an apocalyptic number.

2101949660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101949660 is an abundant number, since it is smaller than the sum of its proper divisors (2343906580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101949660 is a wasteful number, since it uses less digits than its factorization.

2101949660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756245 (or 756243 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 2101949660 is about 45847.0245490370. The cubic root of 2101949660 is about 1280.9753430385.

The spelling of 2101949660 in words is "two billion, one hundred one million, nine hundred forty-nine thousand, six hundred sixty".