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BaseRepresentation
bin101110110000…
…010010100101
3212001200122112
4232300102211
511114201141
61114410405
7206115002
oct56602245
925050575
1012256421
116a11481
124130a05
132701928
1418b08a9
1511217eb
hexbb04a5

12256421 has 2 divisors, whose sum is σ = 12256422. Its totient is φ = 12256420.

The previous prime is 12256403. The next prime is 12256423. The reversal of 12256421 is 12465221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6180196 + 6076225 = 2486^2 + 2465^2 .

It is an emirp because it is prime and its reverse (12465221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12256421 - 214 = 12240037 is a prime.

It is a Sophie Germain prime.

Together with 12256423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12256423) 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, 6128210 + 6128211.

It is an arithmetic number, because the mean of its divisors is an integer number (6128211).

Almost surely, 212256421 is an apocalyptic number.

It is an amenable number.

12256421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12256421 is an equidigital number, since it uses as much as digits as its factorization.

12256421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 12256421 is about 3500.9171655439. The cubic root of 12256421 is about 230.5620845901.

The spelling of 12256421 in words is "twelve million, two hundred fifty-six thousand, four hundred twenty-one".