11212121211 has 32 divisors (see below), whose sum is σ = 15787785216. Its totient is φ = 7068384000.

The previous prime is 11212121209. The next prime is 11212121233.

It is a happy number.

11212121211 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 11212121211 - 2¹ = 11212121209 is a prime.

It is a super-2 number, since 2×11212121211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11212121281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1228776 + ... + 1237866.

It is an arithmetic number, because the mean of its divisors is an integer number (493368288).

Almost surely, 2^11212121211 is an apocalyptic number.

11212121211 is a deficient number, since it is larger than the sum of its proper divisors (4575664005).

11212121211 is a wasteful number, since it uses less digits than its factorization.

11212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9443.

The product of its digits is 16, while the sum is 15.

The spelling of 11212121211 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".