11211212121109 has 96 divisors (see below), whose sum is σ = 15407911169280. Its totient is φ = 7984033200000.

The previous prime is 11211212121097. The next prime is 11211212121163. The reversal of 11211212121109 is 90112121211211.

It is not a de Polignac number, because 11211212121109 - 2²³ = 11211203732501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211212121409) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 187916934 + ... + 187976584.

It is an arithmetic number, because the mean of its divisors is an integer number (160499074680).

Almost surely, 2^{11211212121109} is an apocalyptic number.

It is an amenable number.

11211212121109 is a deficient number, since it is larger than the sum of its proper divisors (4196699048171).

11211212121109 is a wasteful number, since it uses less digits than its factorization.

11211212121109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59820 (or 59783 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 25.

It can be divided in two parts, 112112 and 12121109, that added together give a palindrome (12233221).

The spelling of 11211212121109 in words is "eleven trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred nine".