211221011011 has 8 divisors (see below), whose sum is σ = 214157702000. Its totient is φ = 208285489152.

The previous prime is 211221010999. The next prime is 211221011017. The reversal of 211221011011 is 110110122112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211221011011 - 2⁹ = 211221010499 is a prime.

It is a super-2 number, since 2×211221011011² (a number of 23 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 = 211221010982 and 211221011000.

It is not an unprimeable number, because it can be changed into a prime (211221011017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74740 + ... + 654238.

It is an arithmetic number, because the mean of its divisors is an integer number (26769712750).

Almost surely, 2^211221011011 is an apocalyptic number.

211221011011 is a deficient number, since it is larger than the sum of its proper divisors (2936690989).

211221011011 is an equidigital number, since it uses as much as digits as its factorization.

211221011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584565.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211221011011 its reverse (110110122112), we get a palindrome (321331133123).

The spelling of 211221011011 in words is "two hundred eleven billion, two hundred twenty-one million, eleven thousand, eleven".