2101968775 has 12 divisors (see below), whose sum is σ = 2637846792. Its totient is φ = 1661313440.

The previous prime is 2101968731. The next prime is 2101968811. The reversal of 2101968775 is 5778691012.

It is a happy number.

It is not a de Polignac number, because 2101968775 - 2¹³ = 2101960583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504424 + ... + 508573.

It is an arithmetic number, because the mean of its divisors is an integer number (219820566).

Almost surely, 2^2101968775 is an apocalyptic number.

2101968775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2101968775 is a deficient number, since it is larger than the sum of its proper divisors (535878017).

2101968775 is a wasteful number, since it uses less digits than its factorization.

2101968775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013090 (or 1013085 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 2101968775 is about 45847.2330135636. The cubic root of 2101968775 is about 1280.9792260636.

The spelling of 2101968775 in words is "two billion, one hundred one million, nine hundred sixty-eight thousand, seven hundred seventy-five".