221101011 has 12 divisors (see below), whose sum is σ = 328000192. Its totient is φ = 143416656.

The previous prime is 221101007. The next prime is 221101039. The reversal of 221101011 is 110101122.

It is a happy number.

It is not a de Polignac number, because 221101011 - 2² = 221101007 is a prime.

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 = 221100984 and 221101002.

It is not an unprimeable number, because it can be changed into a prime (221101061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331651 + ... + 332316.

Almost surely, 2^221101011 is an apocalyptic number.

221101011 is a deficient number, since it is larger than the sum of its proper divisors (106899181).

221101011 is a wasteful number, since it uses less digits than its factorization.

221101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664010 (or 664007 counting only the distinct ones).

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

The square root of 221101011 is about 14869.4657267839. The cubic root of 221101011 is about 604.6864582119.

Adding to 221101011 its reverse (110101122), we get a palindrome (331202133).

It can be divided in two parts, 22 and 1101011, that multiplied together give a palindrome (24222242).

The spelling of 221101011 in words is "two hundred twenty-one million, one hundred one thousand, eleven".