1221323242 has 8 divisors (see below), whose sum is σ = 1832479236. Its totient is φ = 610496832.

The previous prime is 1221323239. The next prime is 1221323251. The reversal of 1221323242 is 2423231221.

It can be written as a sum of positive squares in 2 ways, for example, as 1179991201 + 41332041 = 34351^2 + 6429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1221323242² = 2983260922898781128, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 72913 + ... + 88084.

Almost surely, 2^1221323242 is an apocalyptic number.

1221323242 is a deficient number, since it is larger than the sum of its proper divisors (611155994).

1221323242 is a wasteful number, since it uses less digits than its factorization.

1221323242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164792.

The product of its digits is 1152, while the sum is 22.

The square root of 1221323242 is about 34947.4354137754. The cubic root of 1221323242 is about 1068.9159084366.

Adding to 1221323242 its reverse (2423231221), we get a palindrome (3644554463).

The spelling of 1221323242 in words is "one billion, two hundred twenty-one million, three hundred twenty-three thousand, two hundred forty-two".