1221201224 has 16 divisors (see below), whose sum is σ = 2290384620. Its totient is φ = 610432000.

The previous prime is 1221201221. The next prime is 1221201251. The reversal of 1221201224 is 4221021221.

It can be written as a sum of positive squares in 2 ways, for example, as 1184598724 + 36602500 = 34418^2 + 6050^2 .

It is not an unprimeable number, because it can be changed into a prime (1221201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12932 + ... + 51084.

Almost surely, 2^1221201224 is an apocalyptic number.

It is an amenable number.

1221201224 is a deficient number, since it is larger than the sum of its proper divisors (1069183396).

1221201224 is a wasteful number, since it uses less digits than its factorization.

1221201224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42160 (or 42156 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1221201224 is about 34945.6896340593. The cubic root of 1221201224 is about 1068.8803100734.

Adding to 1221201224 its reverse (4221021221), we get a palindrome (5442222445).

The spelling of 1221201224 in words is "one billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-four".