11211220021201 has 16 divisors (see below), whose sum is σ = 11537006740560. Its totient is φ = 10887943956480.

The previous prime is 11211220021163. The next prime is 11211220021231. The reversal of 11211220021201 is 10212002211211.

It can be written as a sum of positive squares in 8 ways, for example, as 330853889601 + 10880366131600 = 575199^2 + 3298540^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211220021201 - 2²⁵ = 11211186466769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211220021231) 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, 50524171 + ... + 50745583.

It is an arithmetic number, because the mean of its divisors is an integer number (721062921285).

Almost surely, 2^{11211220021201} is an apocalyptic number.

It is an amenable number.

11211220021201 is a deficient number, since it is larger than the sum of its proper divisors (325786719359).

11211220021201 is a wasteful number, since it uses less digits than its factorization.

11211220021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227076.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11211220021201 its reverse (10212002211211), we get a palindrome (21423222232412).

The spelling of 11211220021201 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, twenty-one thousand, two hundred one".