211161571723 has 4 divisors (see below), whose sum is σ = 220342509648. Its totient is φ = 201980633800.

The previous prime is 211161571721. The next prime is 211161571757. The reversal of 211161571723 is 327175161112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211161571723 - 2¹ = 211161571721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211161571721) 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, 4590468928 + ... + 4590468973.

It is an arithmetic number, because the mean of its divisors is an integer number (55085627412).

Almost surely, 2^211161571723 is an apocalyptic number.

211161571723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

211161571723 is a deficient number, since it is larger than the sum of its proper divisors (9180937925).

211161571723 is an equidigital number, since it uses as much as digits as its factorization.

211161571723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9180937924.

The product of its digits is 17640, while the sum is 37.

The spelling of 211161571723 in words is "two hundred eleven billion, one hundred sixty-one million, five hundred seventy-one thousand, seven hundred twenty-three".