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24400021 is a prime number
BaseRepresentation
bin101110100010…
…1000010010101
31200220122112111
41131011002111
522221300041
62230551021
7414253042
oct135050225
950818474
1024400021
1112856108
128208471
1350940a9
1433521c9
15221e981
hex1745095

24400021 has 2 divisors, whose sum is σ = 24400022. Its totient is φ = 24400020.

The previous prime is 24400001. The next prime is 24400037. The reversal of 24400021 is 12000442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24354225 + 45796 = 4935^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 24400021 - 211 = 24397973 is a prime.

It is a super-2 number, since 2×244000212 = 1190722049600882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 24399974 and 24400010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24400001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12200010 + 12200011.

It is an arithmetic number, because the mean of its divisors is an integer number (12200011).

Almost surely, 224400021 is an apocalyptic number.

It is an amenable number.

24400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

24400021 is an equidigital number, since it uses as much as digits as its factorization.

24400021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 24400021 is about 4939.6377397538. The cubic root of 24400021 is about 290.0436755464.

Adding to 24400021 its reverse (12000442), we get a palindrome (36400463).

The spelling of 24400021 in words is "twenty-four million, four hundred thousand, twenty-one".