221206061 has 8 divisors (see below), whose sum is σ = 229731744. Its totient is φ = 212834160.

The previous prime is 221206043. The next prime is 221206067. The reversal of 221206061 is 160602122.

It is a happy number.

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-221206061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221206067) 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, 35510 + ... + 41271.

It is an arithmetic number, because the mean of its divisors is an integer number (28716468).

Almost surely, 2^221206061 is an apocalyptic number.

It is an amenable number.

221206061 is a deficient number, since it is larger than the sum of its proper divisors (8525683).

221206061 is an equidigital number, since it uses as much as digits as its factorization.

221206061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76891.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221206061 is about 14872.9977139782. The cubic root of 221206061 is about 604.7822097035.

Adding to 221206061 its reverse (160602122), we get a palindrome (381808183).

The spelling of 221206061 in words is "two hundred twenty-one million, two hundred six thousand, sixty-one".