221206941 has 12 divisors (see below), whose sum is σ = 338316732. Its totient is φ = 138796416.

The previous prime is 221206927. The next prime is 221206943. The reversal of 221206941 is 149602122.

It can be written as a sum of positive squares in 2 ways, for example, as 102941316 + 118265625 = 10146^2 + 10875^2 .

It is not a de Polignac number, because 221206941 - 2⁷ = 221206813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221206943) 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 11 ways as a sum of consecutive naturals, for example, 722746 + ... + 723051.

It is an arithmetic number, because the mean of its divisors is an integer number (28193061).

Almost surely, 2^221206941 is an apocalyptic number.

It is an amenable number.

221206941 is a deficient number, since it is larger than the sum of its proper divisors (117109791).

221206941 is a wasteful number, since it uses less digits than its factorization.

221206941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445820 (or 1445817 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 221206941 is about 14873.0272977629. The cubic root of 221206941 is about 604.7830116822.

The spelling of 221206941 in words is "two hundred twenty-one million, two hundred six thousand, nine hundred forty-one".