1268221 has 2 divisors, whose sum is σ = 1268222. Its totient is φ = 1268220.

The previous prime is 1268213. The next prime is 1268233. The reversal of 1268221 is 1228621.

1268221 = T₉₁₈ + T₉₁₉ + T₉₂₀.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 27225 = 1114^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268221 - 2³ = 1268213 is a prime.

1268221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1268192 and 1268201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634110 + 634111.

It is an arithmetic number, because the mean of its divisors is an integer number (634111).

2^1268221 is an apocalyptic number.

1268221 is the 920-th centered triangular number.

It is an amenable number.

1268221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268221 is an equidigital number, since it uses as much as digits as its factorization.

1268221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

The square root of 1268221 is about 1126.1531867379. The cubic root of 1268221 is about 108.2426243981.

The spelling of 1268221 in words is "one million, two hundred sixty-eight thousand, two hundred twenty-one".