211020222209 has 4 divisors (see below), whose sum is σ = 211048943700. Its totient is φ = 210991500720.

The previous prime is 211020222197. The next prime is 211020222229. The reversal of 211020222209 is 902222020112.

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 54463890625 + 156556331584 = 233375^2 + 395672^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020222209 - 2⁸ = 211020221953 is a prime.

It is a super-2 number, since 2×211020222209² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211020222229) 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, 14349722 + ... + 14364419.

It is an arithmetic number, because the mean of its divisors is an integer number (52762235925).

Almost surely, 2^211020222209 is an apocalyptic number.

It is an amenable number.

211020222209 is a deficient number, since it is larger than the sum of its proper divisors (28721491).

211020222209 is an equidigital number, since it uses as much as digits as its factorization.

211020222209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28721490.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 211020222209 in words is "two hundred eleven billion, twenty million, two hundred twenty-two thousand, two hundred nine".