1221230322 has 24 divisors (see below), whose sum is σ = 2849537964. Its totient is φ = 375763104.

The previous prime is 1221230303. The next prime is 1221230323. The reversal of 1221230322 is 2230321221.

It can be written as a sum of positive squares in 2 ways, for example, as 1095543801 + 125686521 = 33099^2 + 11211^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221230295 and 1221230304.

It is not an unprimeable number, because it can be changed into a prime (1221230323) 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 11 ways as a sum of consecutive naturals, for example, 2609233 + ... + 2609700.

Almost surely, 2^1221230322 is an apocalyptic number.

1221230322 is an abundant number, since it is smaller than the sum of its proper divisors (1628307642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221230322 is a wasteful number, since it uses less digits than its factorization.

1221230322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218954 (or 5218951 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221230322 is about 34946.1059633259. The cubic root of 1221230322 is about 1068.8887995376. Note that the first 3 decimals are identical.

Adding to 1221230322 its reverse (2230321221), we get a palindrome (3451551543).

The spelling of 1221230322 in words is "one billion, two hundred twenty-one million, two hundred thirty thousand, three hundred twenty-two".