221798313 has 48 divisors (see below), whose sum is σ = 362224512. Its totient is φ = 129600000.

The previous prime is 221798281. The next prime is 221798329. The reversal of 221798313 is 313897122.

It is not a de Polignac number, because 221798313 - 2⁵ = 221798281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221798333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 552913 + ... + 553313.

It is an arithmetic number, because the mean of its divisors is an integer number (7546344).

Almost surely, 2^221798313 is an apocalyptic number.

It is an amenable number.

221798313 is a deficient number, since it is larger than the sum of its proper divisors (140426199).

221798313 is a wasteful number, since it uses less digits than its factorization.

221798313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 603 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 221798313 is about 14892.8947152661. The cubic root of 221798313 is about 605.3214720278.

It can be divided in two parts, 221798 and 313, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 221798313 in words is "two hundred twenty-one million, seven hundred ninety-eight thousand, three hundred thirteen".