221011011 has 20 divisors (see below), whose sum is σ = 355550272. Its totient is φ = 136006128.

The previous prime is 221010971. The next prime is 221011057. The reversal of 221011011 is 110110122.

It is a happy number.

It is not a de Polignac number, because 221011011 - 2⁷ = 221010883 is a prime.

It is a super-3 number, since 3×221011011³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010984 and 221011002.

It is not an unprimeable number, because it can be changed into a prime (221011081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 103891 + ... + 105996.

Almost surely, 2^221011011 is an apocalyptic number.

221011011 is a deficient number, since it is larger than the sum of its proper divisors (134539261).

221011011 is a wasteful number, since it uses less digits than its factorization.

221011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209912 (or 209903 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 221011011 is about 14866.4390827124. The cubic root of 221011011 is about 604.6044004428.

Adding to 221011011 its reverse (110110122), we get a palindrome (331121133).

The spelling of 221011011 in words is "two hundred twenty-one million, eleven thousand, eleven".