221871853 has 12 divisors (see below), whose sum is σ = 258345660. Its totient is φ = 189991872.

The previous prime is 221871847. The next prime is 221871857. The reversal of 221871853 is 358178122.

It can be written as a sum of positive squares in 2 ways, for example, as 182709289 + 39162564 = 13517^2 + 6258^2 .

It is not a de Polignac number, because 221871853 - 2¹³ = 221863661 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 (221871857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80425 + ... + 83137.

It is an arithmetic number, because the mean of its divisors is an integer number (21528805).

Almost surely, 2^221871853 is an apocalyptic number.

It is an amenable number.

221871853 is a deficient number, since it is larger than the sum of its proper divisors (36473807).

221871853 is a wasteful number, since it uses less digits than its factorization.

221871853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396 (or 4389 counting only the distinct ones).

The product of its digits is 26880, while the sum is 37.

The square root of 221871853 is about 14895.3634732423. The cubic root of 221871853 is about 605.3883652659.

The spelling of 221871853 in words is "two hundred twenty-one million, eight hundred seventy-one thousand, eight hundred fifty-three".