1223404421242 has 4 divisors (see below), whose sum is σ = 1835106631866. Its totient is φ = 611702210620.

The previous prime is 1223404421177. The next prime is 1223404421251. The reversal of 1223404421242 is 2421244043221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 675077500161 + 548326921081 = 821631^2 + 740491^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 305851105309 + ... + 305851105312.

Almost surely, 2^{1223404421242} is an apocalyptic number.

1223404421242 is a deficient number, since it is larger than the sum of its proper divisors (611702210624).

1223404421242 is an equidigital number, since it uses as much as digits as its factorization.

1223404421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611702210623.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 1223404421242 its reverse (2421244043221), we get a palindrome (3644648464463).

The spelling of 1223404421242 in words is "one trillion, two hundred twenty-three billion, four hundred four million, four hundred twenty-one thousand, two hundred forty-two".