1256221 has 4 divisors (see below), whose sum is σ = 1267452. Its totient is φ = 1244992.

The previous prime is 1256209. The next prime is 1256231. The reversal of 1256221 is 1226521.

1256221 = T₈₉ + T₉₀ + ... + T₂₀₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226521 = 23 ⋅53327.

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 1188100 = 261^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256221 - 2¹⁹ = 731933 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256201) 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 in 3 ways as a sum of consecutive naturals, for example, 5446 + ... + 5671.

It is an arithmetic number, because the mean of its divisors is an integer number (316863).

2^1256221 is an apocalyptic number.

It is an amenable number.

1256221 is a deficient number, since it is larger than the sum of its proper divisors (11231).

1256221 is a wasteful number, since it uses less digits than its factorization.

1256221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230.

The product of its digits is 240, while the sum is 19.

The square root of 1256221 is about 1120.8126516060. The cubic root of 1256221 is about 107.9001420380.

The spelling of 1256221 in words is "one million, two hundred fifty-six thousand, two hundred twenty-one".