12121724 has 6 divisors (see below), whose sum is σ = 21213024. Its totient is φ = 6060860.

The previous prime is 12121721. The next prime is 12121729. The reversal of 12121724 is 42712121.

It is a junction number, because it is equal to n+sod(n) for n = 12121696 and 12121705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1515212 + ... + 1515219.

It is an arithmetic number, because the mean of its divisors is an integer number (3535504).

Almost surely, 2^12121724 is an apocalyptic number.

It is an amenable number.

12121724 is a deficient number, since it is larger than the sum of its proper divisors (9091300).

12121724 is a wasteful number, since it uses less digits than its factorization.

12121724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030435 (or 3030433 counting only the distinct ones).

The product of its digits is 224, while the sum is 20.

The square root of 12121724 is about 3481.6266313320. The cubic root of 12121724 is about 229.7143523822.

Adding to 12121724 its reverse (42712121), we get a palindrome (54833845).

The spelling of 12121724 in words is "twelve million, one hundred twenty-one thousand, seven hundred twenty-four".