11123012121 has 32 divisors (see below), whose sum is σ = 16331121408. Its totient is φ = 6692163840.

The previous prime is 11123012119. The next prime is 11123012123. The reversal of 11123012121 is 12121032111.

It is an interprime number because it is at equal distance from previous prime (11123012119) and next prime (11123012123).

It is not a de Polignac number, because 11123012121 - 2¹ = 11123012119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11123012121.

It is not an unprimeable number, because it can be changed into a prime (11123012123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383295 + ... + 411291.

It is an arithmetic number, because the mean of its divisors is an integer number (510347544).

Almost surely, 2^11123012121 is an apocalyptic number.

It is an amenable number.

11123012121 is a deficient number, since it is larger than the sum of its proper divisors (5208109287).

11123012121 is a wasteful number, since it uses less digits than its factorization.

11123012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28241.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11123012121 its reverse (12121032111), we get a palindrome (23244044232).

The spelling of 11123012121 in words is "eleven billion, one hundred twenty-three million, twelve thousand, one hundred twenty-one".