11071021217 has 4 divisors (see below), whose sum is σ = 11071327380. Its totient is φ = 11070715056.

The previous prime is 11071021201. The next prime is 11071021243. The reversal of 11071021217 is 71212017011.

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 3817262656 + 7253758561 = 61784^2 + 85169^2 .

It is a cyclic number.

It is not a de Polignac number, because 11071021217 - 2⁴ = 11071021201 is a prime.

It is a super-2 number, since 2×11071021217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11071021192 and 11071021201.

It is not an unprimeable number, because it can be changed into a prime (11071023217) 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, 90242 + ... + 174027.

It is an arithmetic number, because the mean of its divisors is an integer number (2767831845).

Almost surely, 2^11071021217 is an apocalyptic number.

It is an amenable number.

11071021217 is a deficient number, since it is larger than the sum of its proper divisors (306163).

11071021217 is an equidigital number, since it uses as much as digits as its factorization.

11071021217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306162.

The product of its (nonzero) digits is 196, while the sum is 23.

Adding to 11071021217 its reverse (71212017011), we get a palindrome (82283038228).

The spelling of 11071021217 in words is "eleven billion, seventy-one million, twenty-one thousand, two hundred seventeen".