24897221 has 2 divisors, whose sum is σ = 24897222. Its totient is φ = 24897220.

The previous prime is 24897199. The next prime is 24897241. The reversal of 24897221 is 12279842.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13432225 + 11464996 = 3665^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 24897221 - 2⁶ = 24897157 is a prime.

It is a super-2 number, since 2×24897221² = 1239743227045682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24897241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12448610 + 12448611.

It is an arithmetic number, because the mean of its divisors is an integer number (12448611).

Almost surely, 2^24897221 is an apocalyptic number.

It is an amenable number.

24897221 is a deficient number, since it is larger than the sum of its proper divisors (1).

24897221 is an equidigital number, since it uses as much as digits as its factorization.

24897221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 24897221 is about 4989.7115147070. The cubic root of 24897221 is about 292.0005199528. Note that the first 3 decimals are identical.

The spelling of 24897221 in words is "twenty-four million, eight hundred ninety-seven thousand, two hundred twenty-one".