24400121 has 4 divisors (see below), whose sum is σ = 24410100. Its totient is φ = 24390144.

The previous prime is 24400109. The next prime is 24400141. The reversal of 24400121 is 12100442.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12100442 = 2 ⋅6050221.

It can be written as a sum of positive squares in 2 ways, for example, as 23145721 + 1254400 = 4811^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24400121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 24400096 and 24400105.

It is not an unprimeable number, because it can be changed into a prime (24400141) 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 3 ways as a sum of consecutive naturals, for example, 1445 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (6102525).

Almost surely, 2^24400121 is an apocalyptic number.

It is an amenable number.

24400121 is a deficient number, since it is larger than the sum of its proper divisors (9979).

24400121 is an equidigital number, since it uses as much as digits as its factorization.

24400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 24400121 is about 4939.6478619432. The cubic root of 24400121 is about 290.0440717800.

Adding to 24400121 its reverse (12100442), we get a palindrome (36500563).

The spelling of 24400121 in words is "twenty-four million, four hundred thousand, one hundred twenty-one".