24921 has 16 divisors (see below), whose sum is σ = 40320. Its totient is φ = 15120.

The previous prime is 24919. The next prime is 24923. The reversal of 24921 is 12942.

It is an interprime number because it is at equal distance from previous prime (24919) and next prime (24923).

It is not a de Polignac number, because 24921 - 2¹ = 24919 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 24894 and 24903.

It is not an unprimeable number, because it can be changed into a prime (24923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316 + ... + 386.

It is an arithmetic number, because the mean of its divisors is an integer number (2520).

2²⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

24921 is a deficient number, since it is larger than the sum of its proper divisors (15399).

24921 is a wasteful number, since it uses less digits than its factorization.

24921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 87 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 24921 is about 157.8638654031. The cubic root of 24921 is about 29.2093452292.

The spelling of 24921 in words is "twenty-four thousand, nine hundred twenty-one".