11211221011 has 8 divisors (see below), whose sum is σ = 11289044304. Its totient is φ = 11133508320.

The previous prime is 11211220973. The next prime is 11211221023. The reversal of 11211221011 is 11012211211.

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 11211221011 - 2¹⁵ = 11211188243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211220982 and 11211221000.

It is not an unprimeable number, because it can be changed into a prime (11211221611) 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, 181221 + ... + 235081.

It is an arithmetic number, because the mean of its divisors is an integer number (1411130538).

Almost surely, 2^11211221011 is an apocalyptic number.

11211221011 is a deficient number, since it is larger than the sum of its proper divisors (77823293).

11211221011 is a wasteful number, since it uses less digits than its factorization.

11211221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55301.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11211221011 its reverse (11012211211), we get a palindrome (22223432222).

The spelling of 11211221011 in words is "eleven billion, two hundred eleven million, two hundred twenty-one thousand, eleven".