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12256221 = 34085407
BaseRepresentation
bin101110110000…
…001111011101
3212001200101010
4232300033131
511114144341
61114405433
7206114265
oct56601735
925050333
1012256221
116a1130a
124130879
132701803
1418b07a5
151121716
hexbb03dd

12256221 has 4 divisors (see below), whose sum is σ = 16341632. Its totient is φ = 8170812.

The previous prime is 12256207. The next prime is 12256271. The reversal of 12256221 is 12265221.

It is a happy number.

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 not a de Polignac number, because 12256221 - 211 = 12254173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256271) 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, 2042701 + ... + 2042706.

It is an arithmetic number, because the mean of its divisors is an integer number (4085408).

Almost surely, 212256221 is an apocalyptic number.

It is an amenable number.

12256221 is a deficient number, since it is larger than the sum of its proper divisors (4085411).

12256221 is an equidigital number, since it uses as much as digits as its factorization.

12256221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085410.

The product of its digits is 480, while the sum is 21.

The square root of 12256221 is about 3500.8886014839. Note that the first 3 decimals coincide. The cubic root of 12256221 is about 230.5608304810.

The spelling of 12256221 in words is "twelve million, two hundred fifty-six thousand, two hundred twenty-one".

Divisors: 1 3 4085407 12256221