1224022221 has 12 divisors (see below), whose sum is σ = 1768363740. Its totient is φ = 815861760.

The previous prime is 1224022213. The next prime is 1224022243. The reversal of 1224022221 is 1222204221.

It can be written as a sum of positive squares in 2 ways, for example, as 16112196 + 1207910025 = 4014^2 + 34755^2 .

It is not a de Polignac number, because 1224022221 - 2³ = 1224022213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1224022194 and 1224022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224022021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59341 + ... + 77261.

It is an arithmetic number, because the mean of its divisors is an integer number (147363645).

Almost surely, 2^1224022221 is an apocalyptic number.

It is an amenable number.

1224022221 is a deficient number, since it is larger than the sum of its proper divisors (544341519).

1224022221 is a wasteful number, since it uses less digits than its factorization.

1224022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25516 (or 25513 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1224022221 is about 34986.0289401355. The cubic root of 1224022221 is about 1069.7027214441.

Adding to 1224022221 its reverse (1222204221), we get a palindrome (2446226442).

The spelling of 1224022221 in words is "one billion, two hundred twenty-four million, twenty-two thousand, two hundred twenty-one".