221211011011 has 4 divisors (see below), whose sum is σ = 221321784672. Its totient is φ = 221100237352.

The previous prime is 221211011003. The next prime is 221211011017. The reversal of 221211011011 is 110110112122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221211011011 - 2³ = 221211011003 is a prime.

It is a super-2 number, since 2×221211011011² (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 = 221211010982 and 221211011000.

It is not an unprimeable number, because it can be changed into a prime (221211011017) 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 3 ways as a sum of consecutive naturals, for example, 55383835 + ... + 55387828.

It is an arithmetic number, because the mean of its divisors is an integer number (55330446168).

Almost surely, 2^221211011011 is an apocalyptic number.

221211011011 is a deficient number, since it is larger than the sum of its proper divisors (110773661).

221211011011 is a wasteful number, since it uses less digits than its factorization.

221211011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110773660.

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

Adding to 221211011011 its reverse (110110112122), we get a palindrome (331321123133).

The spelling of 221211011011 in words is "two hundred twenty-one billion, two hundred eleven million, eleven thousand, eleven".