24997921 has 16 divisors (see below), whose sum is σ = 27808704. Its totient is φ = 22325184.

The previous prime is 24997919. The next prime is 24997933. The reversal of 24997921 is 12979942.

It is a cyclic number.

It is not a de Polignac number, because 24997921 - 2¹ = 24997919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24997961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110010 + ... + 110236.

It is an arithmetic number, because the mean of its divisors is an integer number (1738044).

Almost surely, 2^24997921 is an apocalyptic number.

It is an amenable number.

24997921 is a deficient number, since it is larger than the sum of its proper divisors (2810783).

24997921 is a wasteful number, since it uses less digits than its factorization.

24997921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its digits is 81648, while the sum is 43.

The square root of 24997921 is about 4999.7920956776. The cubic root of 24997921 is about 292.3936682194.

It can be divided in two parts, 249979 and 21, that added together give a square (250000 = 500²).

The spelling of 24997921 in words is "twenty-four million, nine hundred ninety-seven thousand, nine hundred twenty-one".