1221433442 has 32 divisors (see below), whose sum is σ = 1981841904. Its totient is φ = 562432000.

The previous prime is 1221433429. The next prime is 1221433453. The reversal of 1221433442 is 2443341221.

It can be written as a sum of positive squares in 8 ways, for example, as 349353481 + 872079961 = 18691^2 + 29531^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 938192 + ... + 939492.

Almost surely, 2^1221433442 is an apocalyptic number.

1221433442 is a deficient number, since it is larger than the sum of its proper divisors (760408462).

1221433442 is a wasteful number, since it uses less digits than its factorization.

1221433442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894.

The product of its digits is 4608, while the sum is 26.

The square root of 1221433442 is about 34949.0120318157. The cubic root of 1221433442 is about 1068.9480568983.

Adding to 1221433442 its reverse (2443341221), we get a palindrome (3664774663).

The spelling of 1221433442 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, four hundred forty-two".