221100001011 has 12 divisors (see below), whose sum is σ = 327998200192. Its totient is φ = 143416216656.

The previous prime is 221100001009. The next prime is 221100001079. The reversal of 221100001011 is 110100001122.

It is a happy number.

It is not a de Polignac number, because 221100001011 - 2¹ = 221100001009 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 = 221100000984 and 221100001002.

It is not an unprimeable number, because it can be changed into a prime (221100001091) 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, 331981651 + ... + 331982316.

Almost surely, 2^221100001011 is an apocalyptic number.

221100001011 is a deficient number, since it is larger than the sum of its proper divisors (106898199181).

221100001011 is a wasteful number, since it uses less digits than its factorization.

221100001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663964010 (or 663964007 counting only the distinct ones).

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

Adding to 221100001011 its reverse (110100001122), we get a palindrome (331200002133).

The spelling of 221100001011 in words is "two hundred twenty-one billion, one hundred million, one thousand, eleven".