221242360 has 16 divisors (see below), whose sum is σ = 497795400. Its totient is φ = 88496928.

The previous prime is 221242337. The next prime is 221242409. The reversal of 221242360 is 63242122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765490 + ... + 2765569.

Almost surely, 2^221242360 is an apocalyptic number.

221242360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221242360 is an abundant number, since it is smaller than the sum of its proper divisors (276553040).

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

221242360 is a wasteful number, since it uses less digits than its factorization.

221242360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5531070 (or 5531066 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 221242360 is about 14874.2179626359. The cubic root of 221242360 is about 604.8152886475.

Adding to 221242360 its reverse (63242122), we get a palindrome (284484482).

The spelling of 221242360 in words is "two hundred twenty-one million, two hundred forty-two thousand, three hundred sixty".