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12421261 is a prime number
BaseRepresentation
bin101111011000…
…100010001101
3212101001202201
4233120202031
511134440021
61122121501
7210402406
oct57304215
925331681
1012421261
117014306
1241b0291
13275b978
1419149ad
151155591
hexbd888d

12421261 has 2 divisors, whose sum is σ = 12421262. Its totient is φ = 12421260.

The previous prime is 12421243. The next prime is 12421267. The reversal of 12421261 is 16212421.

12421261 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9424900 + 2996361 = 3070^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421261 - 25 = 12421229 is a prime.

It is a super-3 number, since 3×124212613 (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210630 + 6210631.

It is an arithmetic number, because the mean of its divisors is an integer number (6210631).

Almost surely, 212421261 is an apocalyptic number.

It is an amenable number.

12421261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421261 is an equidigital number, since it uses as much as digits as its factorization.

12421261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 12421261 is about 3524.3809385479. The cubic root of 12421261 is about 231.5911161496.

Adding to 12421261 its reverse (16212421), we get a palindrome (28633682).

The spelling of 12421261 in words is "twelve million, four hundred twenty-one thousand, two hundred sixty-one".