1227680221 has 4 divisors (see below), whose sum is σ = 1233041500. Its totient is φ = 1222318944.

The previous prime is 1227680203. The next prime is 1227680257. The reversal of 1227680221 is 1220867221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220867221 = 7 ⋅174409603.

It can be written as a sum of positive squares in 2 ways, for example, as 881199225 + 346480996 = 29685^2 + 18614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1227680221 - 2¹¹ = 1227678173 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 (1227680281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2680296 + ... + 2680753.

It is an arithmetic number, because the mean of its divisors is an integer number (308260375).

Almost surely, 2^1227680221 is an apocalyptic number.

It is an amenable number.

1227680221 is a deficient number, since it is larger than the sum of its proper divisors (5361279).

1227680221 is an equidigital number, since it uses as much as digits as its factorization.

1227680221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361278.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1227680221 is about 35038.2679509133. The cubic root of 1227680221 is about 1070.7672666688.

The spelling of 1227680221 in words is "one billion, two hundred twenty-seven million, six hundred eighty thousand, two hundred twenty-one".