211220011017005 has 4 divisors (see below), whose sum is σ = 253464013220412. Its totient is φ = 168976008813600.

The previous prime is 211220011016983. The next prime is 211220011017007. The reversal of 211220011017005 is 500710110022112.

It is a happy number.

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 30557755800649 + 180662255216356 = 5527907^2 + 13441066^2 .

It is not a de Polignac number, because 211220011017005 - 2¹² = 211220011012909 is a prime.

It is a super-2 number, since 2×211220011017005² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220011017007) 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, 21122001101696 + ... + 21122001101705.

It is an arithmetic number, because the mean of its divisors is an integer number (63366003305103).

Almost surely, 2^{211220011017005} is an apocalyptic number.

It is an amenable number.

211220011017005 is a deficient number, since it is larger than the sum of its proper divisors (42244002203407).

211220011017005 is an equidigital number, since it uses as much as digits as its factorization.

211220011017005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42244002203406.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 211220011017005 its reverse (500710110022112), we get a palindrome (711930121039117).

The spelling of 211220011017005 in words is "two hundred eleven trillion, two hundred twenty billion, eleven million, seventeen thousand, five".