11101221112121 has 4 divisors (see below), whose sum is σ = 12687109842432. Its totient is φ = 9515332381812.

The previous prime is 11101221112117. The next prime is 11101221112123. The reversal of 11101221112121 is 12121112210111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11101221112121 - 2² = 11101221112117 is a prime.

It is a super-2 number, since 2×11101221112121² (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 11101221112121.

It is not an unprimeable number, because it can be changed into a prime (11101221112123) 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, 792944365145 + ... + 792944365158.

It is an arithmetic number, because the mean of its divisors is an integer number (3171777460608).

Almost surely, 2^{11101221112121} is an apocalyptic number.

It is an amenable number.

11101221112121 is a deficient number, since it is larger than the sum of its proper divisors (1585888730311).

11101221112121 is an equidigital number, since it uses as much as digits as its factorization.

11101221112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585888730310.

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

Adding to 11101221112121 its reverse (12121112210111), we get a palindrome (23222333322232).

The spelling of 11101221112121 in words is "eleven trillion, one hundred one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-one".