24872221 has 4 divisors (see below), whose sum is σ = 27133344. Its totient is φ = 22611100.

The previous prime is 24872191. The next prime is 24872231. The reversal of 24872221 is 12227842.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 24872221 - 2⁷ = 24872093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 24872221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24872231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130545 + ... + 1130566.

It is an arithmetic number, because the mean of its divisors is an integer number (6783336).

Almost surely, 2^24872221 is an apocalyptic number.

It is an amenable number.

24872221 is a deficient number, since it is larger than the sum of its proper divisors (2261123).

24872221 is a wasteful number, since it uses less digits than its factorization.

24872221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261122.

The product of its digits is 3584, while the sum is 28.

The square root of 24872221 is about 4987.2057306672. The cubic root of 24872221 is about 291.9027519094.

The spelling of 24872221 in words is "twenty-four million, eight hundred seventy-two thousand, two hundred twenty-one".