221316616249 has 3 divisors (see below), whose sum is σ = 221317086693. Its totient is φ = 221316145806.

The previous prime is 221316616243. The next prime is 221316616321. The reversal of 221316616249 is 942616613122.

The square root of 221316616249 is 470443.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 221316616249 - 2⁷ = 221316616121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221316616243) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 235222 + ... + 705664.

It is an arithmetic number, because the mean of its divisors is an integer number (73772362231).

Almost surely, 2^221316616249 is an apocalyptic number.

221316616249 is the 470443-rd square number.

221316616249 is the 235222-nd centered octagonal number.

It is an amenable number.

221316616249 is a deficient number, since it is larger than the sum of its proper divisors (470444).

221316616249 is an frugal number, since it uses more digits than its factorization.

221316616249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940886 (or 470443 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The spelling of 221316616249 in words is "two hundred twenty-one billion, three hundred sixteen million, six hundred sixteen thousand, two hundred forty-nine".