12121544 has 32 divisors (see below), whose sum is σ = 25336800. Its totient is φ = 5402880.

The previous prime is 12121541. The next prime is 12121547. The reversal of 12121544 is 44512121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12121541) and next prime (12121547).

It is not an unprimeable number, because it can be changed into a prime (12121541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239 + ... + 4929.

It is an arithmetic number, because the mean of its divisors is an integer number (791775).

Almost surely, 2^12121544 is an apocalyptic number.

It is an amenable number.

12121544 is an abundant number, since it is smaller than the sum of its proper divisors (13215256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121544 is a wasteful number, since it uses less digits than its factorization.

12121544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733 (or 4729 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 12121544 is about 3481.6007812499. The cubic root of 12121544 is about 229.7132153386.

Adding to 12121544 its reverse (44512121), we get a palindrome (56633665).

The spelling of 12121544 in words is "twelve million, one hundred twenty-one thousand, five hundred forty-four".