11101212121211 has 4 divisors (see below), whose sum is σ = 11685486443400. Its totient is φ = 10516937799024.

The previous prime is 11101212121177. The next prime is 11101212121231. The reversal of 11101212121211 is 11212121210111.

11101212121211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11101212121211 is a prime.

It is a super-2 number, since 2×11101212121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11101212121211.

It is not an unprimeable number, because it can be changed into a prime (11101212121231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292137161066 + ... + 292137161103.

It is an arithmetic number, because the mean of its divisors is an integer number (2921371610850).

Almost surely, 2^{11101212121211} is an apocalyptic number.

11101212121211 is a deficient number, since it is larger than the sum of its proper divisors (584274322189).

11101212121211 is an equidigital number, since it uses as much as digits as its factorization.

11101212121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584274322188.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11101212121211 its reverse (11212121210111), we get a palindrome (22313333331322).

The spelling of 11101212121211 in words is "eleven trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".