1222277221 has 8 divisors (see below), whose sum is σ = 1338141888. Its totient is φ = 1107204000.

The previous prime is 1222277209. The next prime is 1222277227. The reversal of 1222277221 is 1227722221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1222277221 - 2²⁷ = 1088059493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222277221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222277227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194625 + ... + 200806.

It is an arithmetic number, because the mean of its divisors is an integer number (167267736).

Almost surely, 2^1222277221 is an apocalyptic number.

1222277221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222277221 is a deficient number, since it is larger than the sum of its proper divisors (115864667).

1222277221 is a wasteful number, since it uses less digits than its factorization.

1222277221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395723.

The product of its digits is 3136, while the sum is 28.

The square root of 1222277221 is about 34961.0815193123. The cubic root of 1222277221 is about 1069.1941470733.

Adding to 1222277221 its reverse (1227722221), we get a palindrome (2449999442).

The spelling of 1222277221 in words is "one billion, two hundred twenty-two million, two hundred seventy-seven thousand, two hundred twenty-one".