1221273 has 6 divisors (see below), whose sum is σ = 1764074. Its totient is φ = 814176.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221273 is 3721221.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 205209 = 1008^2 + 453^2 .

It is not a de Polignac number, because 1221273 - 2⁹ = 1220761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67840 + ... + 67857.

2^1221273 is an apocalyptic number.

It is an amenable number.

1221273 is a deficient number, since it is larger than the sum of its proper divisors (542801).

1221273 is a wasteful number, since it uses less digits than its factorization.

1221273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135703 (or 135700 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 1221273 is about 1105.1122114971. The cubic root of 1221273 is about 106.8901250780.

Adding to 1221273 its reverse (3721221), we get a palindrome (4942494).

It can be divided in two parts, 1221 and 273, that multiplied together give a palindrome (333333).

The spelling of 1221273 in words is "one million, two hundred twenty-one thousand, two hundred seventy-three".