221730246 has 12 divisors (see below), whose sum is σ = 480415572. Its totient is φ = 73910076.

The previous prime is 221730241. The next prime is 221730251. The reversal of 221730246 is 642037122.

It is an interprime number because it is at equal distance from previous prime (221730241) and next prime (221730251).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221730241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6159156 + ... + 6159191.

It is an arithmetic number, because the mean of its divisors is an integer number (40034631).

Almost surely, 2^221730246 is an apocalyptic number.

221730246 is an abundant number, since it is smaller than the sum of its proper divisors (258685326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221730246 is a wasteful number, since it uses less digits than its factorization.

221730246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12318355 (or 12318352 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 221730246 is about 14890.6093226570. The cubic root of 221730246 is about 605.2595439461.

Adding to 221730246 its reverse (642037122), we get a palindrome (863767368).

The spelling of 221730246 in words is "two hundred twenty-one million, seven hundred thirty thousand, two hundred forty-six".