2097243216891 has 12 divisors (see below), whose sum is σ = 3029364820560. Its totient is φ = 1398155910480.

The previous prime is 2097243216793. The next prime is 2097243216953. The reversal of 2097243216891 is 1986123427902.

2097243216891 is a `hidden beast` number, since 20 + 97 + 2 + 432 + 16 + 8 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-2097243216891 is a prime.

It is a super-2 number, since 2×2097243216891² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2097243916891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2591845 + ... + 3303353.

It is an arithmetic number, because the mean of its divisors is an integer number (252447068380).

Almost surely, 2^{2097243216891} is an apocalyptic number.

2097243216891 is a deficient number, since it is larger than the sum of its proper divisors (932121603669).

2097243216891 is a wasteful number, since it uses less digits than its factorization.

2097243216891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039026 (or 1039023 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 2097243216891 in words is "two trillion, ninety-seven billion, two hundred forty-three million, two hundred sixteen thousand, eight hundred ninety-one".