211100160720561 has 32 divisors (see below), whose sum is σ = 324718432865280. Its totient is φ = 119488161963456.

The previous prime is 211100160720551. The next prime is 211100160720587. The reversal of 211100160720561 is 165027061001112.

It is not a de Polignac number, because 211100160720561 - 2⁵ = 211100160720529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211100160720551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15311070 + ... + 25624776.

It is an arithmetic number, because the mean of its divisors is an integer number (10147451027040).

Almost surely, 2^{211100160720561} is an apocalyptic number.

211100160720561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211100160720561 is a deficient number, since it is larger than the sum of its proper divisors (113618272144719).

211100160720561 is a wasteful number, since it uses less digits than its factorization.

211100160720561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322933.

The product of its (nonzero) digits is 5040, while the sum is 33.

The spelling of 211100160720561 in words is "two hundred eleven trillion, one hundred billion, one hundred sixty million, seven hundred twenty thousand, five hundred sixty-one".