2101949111 has 4 divisors (see below), whose sum is σ = 2102046552. Its totient is φ = 2101851672.

The previous prime is 2101949099. The next prime is 2101949123. The reversal of 2101949111 is 1119491012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (2101949099) and next prime (2101949123).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101949111 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 (2101949131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365 + ... + 64838.

It is an arithmetic number, because the mean of its divisors is an integer number (525511638).

Almost surely, 2^2101949111 is an apocalyptic number.

2101949111 is a deficient number, since it is larger than the sum of its proper divisors (97441).

2101949111 is an equidigital number, since it uses as much as digits as its factorization.

2101949111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97440.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 2101949111 is about 45847.0185617342. The cubic root of 2101949111 is about 1280.9752315142.

The spelling of 2101949111 in words is "two billion, one hundred one million, nine hundred forty-nine thousand, one hundred eleven".