221534523723211 has 4 divisors (see below), whose sum is σ = 224338758200800. Its totient is φ = 218730289245624.

The previous prime is 221534523723209. The next prime is 221534523723221. The reversal of 221534523723211 is 112327325435122.

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 221534523723211 - 2¹ = 221534523723209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221534523723221) 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, 1402117238676 + ... + 1402117238833.

It is an arithmetic number, because the mean of its divisors is an integer number (56084689550200).

Almost surely, 2^{221534523723211} is an apocalyptic number.

221534523723211 is a deficient number, since it is larger than the sum of its proper divisors (2804234477589).

221534523723211 is an equidigital number, since it uses as much as digits as its factorization.

221534523723211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2804234477588.

The product of its digits is 604800, while the sum is 43.

The spelling of 221534523723211 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, five hundred twenty-three million, seven hundred twenty-three thousand, two hundred eleven".