12121424 has 30 divisors (see below), whose sum is σ = 27321354. Its totient is φ = 5194560.

The previous prime is 12121423. The next prime is 12121427. The reversal of 12121424 is 42412121.

12121424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8809024 + 3312400 = 2968^2 + 1820^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6947 + ... + 8514.

Almost surely, 2^12121424 is an apocalyptic number.

12121424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12121424 is an abundant number, since it is smaller than the sum of its proper divisors (15199930).

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

12121424 is a wasteful number, since it uses less digits than its factorization.

12121424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15483 (or 15470 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 12121424 is about 3481.5835477552. The cubic root of 12121424 is about 229.7124573032.

Adding to 12121424 its reverse (42412121), we get a palindrome (54533545).

The spelling of 12121424 in words is "twelve million, one hundred twenty-one thousand, four hundred twenty-four".