221332061 has 8 divisors (see below), whose sum is σ = 235544760. Its totient is φ = 207251968.

The previous prime is 221332043. The next prime is 221332079. The reversal of 221332061 is 160233122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221332043) and next prime (221332079).

It can be written as a sum of positive squares in 4 ways, for example, as 94206436 + 127125625 = 9706^2 + 11275^2 .

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-221332061 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 (221332361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29696 + ... + 36393.

It is an arithmetic number, because the mean of its divisors is an integer number (29443095).

Almost surely, 2^221332061 is an apocalyptic number.

It is an amenable number.

221332061 is a deficient number, since it is larger than the sum of its proper divisors (14212699).

221332061 is a wasteful number, since it uses less digits than its factorization.

221332061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66303.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 221332061 is about 14877.2329752545. The cubic root of 221332061 is about 604.8970168268.

Adding to 221332061 its reverse (160233122), we get a palindrome (381565183).

The spelling of 221332061 in words is "two hundred twenty-one million, three hundred thirty-two thousand, sixty-one".