1221065224 has 16 divisors (see below), whose sum is σ = 2292533100. Its totient is φ = 609723072.

The previous prime is 1221065203. The next prime is 1221065269. The reversal of 1221065224 is 4225601221.

It can be written as a sum of positive squares in 2 ways, for example, as 1197852100 + 23213124 = 34610^2 + 4818^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94759 + ... + 106870.

Almost surely, 2^1221065224 is an apocalyptic number.

It is an amenable number.

1221065224 is a deficient number, since it is larger than the sum of its proper divisors (1071467876).

1221065224 is a wasteful number, since it uses less digits than its factorization.

1221065224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202392 (or 202388 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1221065224 is about 34943.7437032726. The cubic root of 1221065224 is about 1068.8406297117.

Adding to 1221065224 its reverse (4225601221), we get a palindrome (5446666445).

The spelling of 1221065224 in words is "one billion, two hundred twenty-one million, sixty-five thousand, two hundred twenty-four".