220211009 has 4 divisors (see below), whose sum is σ = 222685380. Its totient is φ = 217736640.

The previous prime is 220211003. The next prime is 220211021. The reversal of 220211009 is 900112022.

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 62457409 + 157753600 = 7903^2 + 12560^2 .

It is a cyclic number.

It is not a de Polignac number, because 220211009 - 2²⁴ = 203433793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220211003) 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, 1237052 + ... + 1237229.

It is an arithmetic number, because the mean of its divisors is an integer number (55671345).

Almost surely, 2^220211009 is an apocalyptic number.

It is an amenable number.

220211009 is a deficient number, since it is larger than the sum of its proper divisors (2474371).

220211009 is an equidigital number, since it uses as much as digits as its factorization.

220211009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474370.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 220211009 is about 14839.5083813447. The cubic root of 220211009 is about 603.8740152494.

The spelling of 220211009 in words is "two hundred twenty million, two hundred eleven thousand, nine".