11021221111 has 8 divisors (see below), whose sum is σ = 11884244400. Its totient is φ = 10186493760.

The previous prime is 11021221093. The next prime is 11021221139. The reversal of 11021221111 is 11112212011.

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 11021221111 - 2¹¹ = 11021219063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021221091 and 11021221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021228111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7073176 + ... + 7074733.

It is an arithmetic number, because the mean of its divisors is an integer number (1485530550).

Almost surely, 2^11021221111 is an apocalyptic number.

11021221111 is a deficient number, since it is larger than the sum of its proper divisors (863023289).

11021221111 is a wasteful number, since it uses less digits than its factorization.

11021221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14147969.

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

Adding to 11021221111 its reverse (11112212011), we get a palindrome (22133433122).

The spelling of 11021221111 in words is "eleven billion, twenty-one million, two hundred twenty-one thousand, one hundred eleven".