11211220221211 has 8 divisors (see below), whose sum is σ = 11804339473920. Its totient is φ = 10618406471592.

The previous prime is 11211220221209. The next prime is 11211220221241. The reversal of 11211220221211 is 11212202211211.

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 11211220221211 - 2¹ = 11211220221209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211220221241) 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, 76300435 + ... + 76447228.

It is an arithmetic number, because the mean of its divisors is an integer number (1475542434240).

Almost surely, 2^{11211220221211} is an apocalyptic number.

11211220221211 is a deficient number, since it is larger than the sum of its proper divisors (593119252709).

11211220221211 is a wasteful number, since it uses less digits than its factorization.

11211220221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152751545.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11211220221211 its reverse (11212202211211), we get a palindrome (22423422432422).

The spelling of 11211220221211 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, two hundred eleven".