221716853 has 4 divisors (see below), whose sum is σ = 221749440. Its totient is φ = 221684268.

The previous prime is 221716843. The next prime is 221716903. The reversal of 221716853 is 358617122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221716853 - 2⁸ = 221716597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221716843) 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, 1775 + ... + 21132.

It is an arithmetic number, because the mean of its divisors is an integer number (55437360).

Almost surely, 2^221716853 is an apocalyptic number.

It is an amenable number.

221716853 is a deficient number, since it is larger than the sum of its proper divisors (32587).

221716853 is an equidigital number, since it uses as much as digits as its factorization.

221716853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32586.

The product of its digits is 20160, while the sum is 35.

The square root of 221716853 is about 14890.1596029055. The cubic root of 221716853 is about 605.2473573598.

The spelling of 221716853 in words is "two hundred twenty-one million, seven hundred sixteen thousand, eight hundred fifty-three".