11021201221 has 16 divisors (see below), whose sum is σ = 11335661568. Its totient is φ = 10710345600.

The previous prime is 11021201197. The next prime is 11021201281. The reversal of 11021201221 is 12210212011.

It is a cyclic number.

It is not a de Polignac number, because 11021201221 - 2¹¹ = 11021199173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021201281) 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, 4830601 + ... + 4832881.

It is an arithmetic number, because the mean of its divisors is an integer number (708478848).

Almost surely, 2^11021201221 is an apocalyptic number.

It is an amenable number.

11021201221 is a deficient number, since it is larger than the sum of its proper divisors (314460347).

11021201221 is a wasteful number, since it uses less digits than its factorization.

11021201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11021201221 its reverse (12210212011), we get a palindrome (23231413232).

The spelling of 11021201221 in words is "eleven billion, twenty-one million, two hundred one thousand, two hundred twenty-one".