11101210121 has 4 divisors (see below), whose sum is σ = 11484010500. Its totient is φ = 10718409744.

The previous prime is 11101210097. The next prime is 11101210139. The reversal of 11101210121 is 12101210111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12101210111 = 191 ⋅63357121.

It can be written as a sum of positive squares in 2 ways, for example, as 7440960121 + 3660250000 = 86261^2 + 60500^2 .

It is not a de Polignac number, because 11101210121 - 2¹⁴ = 11101193737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11101210151) 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, 191400146 + ... + 191400203.

It is an arithmetic number, because the mean of its divisors is an integer number (2871002625).

Almost surely, 2^11101210121 is an apocalyptic number.

It is an amenable number.

11101210121 is a deficient number, since it is larger than the sum of its proper divisors (382800379).

11101210121 is an equidigital number, since it uses as much as digits as its factorization.

11101210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382800378.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11101210121 its reverse (12101210111), we get a palindrome (23202420232).

The spelling of 11101210121 in words is "eleven billion, one hundred one million, two hundred ten thousand, one hundred twenty-one".