221240351 has 8 divisors (see below), whose sum is σ = 236703600. Its totient is φ = 206159040.

The previous prime is 221240317. The next prime is 221240377. The reversal of 221240351 is 153042122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221240351 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 (221240251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94286 + ... + 96603.

It is an arithmetic number, because the mean of its divisors is an integer number (29587950).

Almost surely, 2^221240351 is an apocalyptic number.

221240351 is a deficient number, since it is larger than the sum of its proper divisors (15463249).

221240351 is a wasteful number, since it uses less digits than its factorization.

221240351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190969.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221240351 is about 14874.1504295203. The cubic root of 221240351 is about 604.8134579589.

Adding to 221240351 its reverse (153042122), we get a palindrome (374282473).

The spelling of 221240351 in words is "two hundred twenty-one million, two hundred forty thousand, three hundred fifty-one".