11211220211211 has 16 divisors (see below), whose sum is σ = 16609467985920. Its totient is φ = 7474033021320.

The previous prime is 11211220211143. The next prime is 11211220211221. The reversal of 11211220211211 is 11211202211211.

It is a happy number.

11211220211211 is a `hidden beast` number, since 1 + 1 + 21 + 1 + 220 + 211 + 211 = 666.

It is not a de Polignac number, because 11211220211211 - 2⁷ = 11211220211083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211220211221) 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, 1335195 + ... + 4919876.

It is an arithmetic number, because the mean of its divisors is an integer number (1038091749120).

Almost surely, 2^{11211220211211} is an apocalyptic number.

11211220211211 is a deficient number, since it is larger than the sum of its proper divisors (5398247774709).

11211220211211 is an equidigital number, since it uses as much as digits as its factorization.

11211220211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321463 (or 6321457 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11211220211211 its reverse (11211202211211), we get a palindrome (22422422422422).

The spelling of 11211220211211 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".