11256221 has 2 divisors, whose sum is σ = 11256222. Its totient is φ = 11256220.

The previous prime is 11256199. The next prime is 11256247. The reversal of 11256221 is 12265211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 196 = 3355^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 11256221 - 2²² = 7061917 is a prime.

It is a super-2 number, since 2×11256221² = 253405022401682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₇₄₂₃₄₀ and since 11256221 and 742340 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 11256193 and 11256202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11256281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5628110 + 5628111.

It is an arithmetic number, because the mean of its divisors is an integer number (5628111).

Almost surely, 2^11256221 is an apocalyptic number.

It is an amenable number.

11256221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11256221 is an equidigital number, since it uses as much as digits as its factorization.

11256221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 11256221 is about 3355.0292100070. The cubic root of 11256221 is about 224.1115316711. Note that the first 3 decimals are identical.

The spelling of 11256221 in words is "eleven million, two hundred fifty-six thousand, two hundred twenty-one".