11145442121 has 16 divisors (see below), whose sum is σ = 12584140800. Its totient is φ = 9779389200.

The previous prime is 11145442117. The next prime is 11145442129. The reversal of 11145442121 is 12124454111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11145442121 - 2² = 11145442117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11145442129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86120 + ... + 172358.

It is an arithmetic number, because the mean of its divisors is an integer number (786508800).

Almost surely, 2^11145442121 is an apocalyptic number.

11145442121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11145442121 is a deficient number, since it is larger than the sum of its proper divisors (1438698679).

11145442121 is a wasteful number, since it uses less digits than its factorization.

11145442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86660.

The product of its digits is 1280, while the sum is 26.

Adding to 11145442121 its reverse (12124454111), we get a palindrome (23269896232).

The spelling of 11145442121 in words is "eleven billion, one hundred forty-five million, four hundred forty-two thousand, one hundred twenty-one".