11021221206 has 32 divisors (see below), whose sum is σ = 25780636800. Its totient is φ = 3480385320.

The previous prime is 11021221201. The next prime is 11021221207. The reversal of 11021221206 is 60212212011.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021221201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5369940 + ... + 5371991.

It is an arithmetic number, because the mean of its divisors is an integer number (805644900).

Almost surely, 2^11021221206 is an apocalyptic number.

11021221206 is an abundant number, since it is smaller than the sum of its proper divisors (14759415594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11021221206 is a wasteful number, since it uses less digits than its factorization.

11021221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10741961 (or 10741955 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 11021221206 its reverse (60212212011), we get a palindrome (71233433217).

The spelling of 11021221206 in words is "eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred six".