221042351 has 8 divisors (see below), whose sum is σ = 232696800. Its totient is φ = 209558272.

The previous prime is 221042309. The next prime is 221042377. The reversal of 221042351 is 153240122.

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

It is a cyclic number.

It is not a de Polignac number, because 221042351 - 2⁶ = 221042287 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 (221062351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39926 + ... + 45123.

It is an arithmetic number, because the mean of its divisors is an integer number (29087100).

Almost surely, 2^221042351 is an apocalyptic number.

221042351 is a deficient number, since it is larger than the sum of its proper divisors (11654449).

221042351 is a wasteful number, since it uses less digits than its factorization.

221042351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85185.

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

The square root of 221042351 is about 14867.4930973584. The cubic root of 221042351 is about 604.6329773091.

Adding to 221042351 its reverse (153240122), we get a palindrome (374282473).

The spelling of 221042351 in words is "two hundred twenty-one million, forty-two thousand, three hundred fifty-one".