221026361 has 8 divisors (see below), whose sum is σ = 223841280. Its totient is φ = 218224512.

The previous prime is 221026349. The next prime is 221026381. The reversal of 221026361 is 163620122.

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-221026361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221026301) 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, 33320 + ... + 39398.

It is an arithmetic number, because the mean of its divisors is an integer number (27980160).

Almost surely, 2^221026361 is an apocalyptic number.

It is an amenable number.

221026361 is a deficient number, since it is larger than the sum of its proper divisors (2814919).

221026361 is a wasteful number, since it uses less digits than its factorization.

221026361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6535.

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

The square root of 221026361 is about 14866.9553372572. The cubic root of 221026361 is about 604.6183974267.

Adding to 221026361 its reverse (163620122), we get a palindrome (384646483).

The spelling of 221026361 in words is "two hundred twenty-one million, twenty-six thousand, three hundred sixty-one".