221061289 has 4 divisors (see below), whose sum is σ = 221097556. Its totient is φ = 221025024.

The previous prime is 221061263. The next prime is 221061293. The reversal of 221061289 is 982160122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 217061289 + 4000000 = 14733^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 221061289 - 2⁷ = 221061161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221061289.

It is not an unprimeable number, because it can be changed into a prime (221061209) 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, 6504 + ... + 22009.

It is an arithmetic number, because the mean of its divisors is an integer number (55274389).

Almost surely, 2^221061289 is an apocalyptic number.

It is an amenable number.

221061289 is a deficient number, since it is larger than the sum of its proper divisors (36267).

221061289 is an equidigital number, since it uses as much as digits as its factorization.

221061289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36266.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 221061289 is about 14868.1299765640. The cubic root of 221061289 is about 604.6502443053.

The spelling of 221061289 in words is "two hundred twenty-one million, sixty-one thousand, two hundred eighty-nine".