221302229 has 4 divisors (see below), whose sum is σ = 221604876. Its totient is φ = 220999584.

The previous prime is 221302223. The next prime is 221302241. The reversal of 221302229 is 922203122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 922203122 = 2 ⋅461101561.

It can be written as a sum of positive squares in 2 ways, for example, as 215062225 + 6240004 = 14665^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 221302229 - 2¹⁶ = 221236693 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 (221302223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150224 + ... + 151689.

It is an arithmetic number, because the mean of its divisors is an integer number (55401219).

Almost surely, 2^221302229 is an apocalyptic number.

It is an amenable number.

221302229 is a deficient number, since it is larger than the sum of its proper divisors (302647).

221302229 is an equidigital number, since it uses as much as digits as its factorization.

221302229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302646.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 221302229 is about 14876.2303356731. The cubic root of 221302229 is about 604.8698388112.

The spelling of 221302229 in words is "two hundred twenty-one million, three hundred two thousand, two hundred twenty-nine".