1221442413434 has 4 divisors (see below), whose sum is σ = 1832163620154. Its totient is φ = 610721206716.

The previous prime is 1221442413379. The next prime is 1221442413463. The reversal of 1221442413434 is 4343142441221.

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., 880964328409 + 340478085025 = 938597^2 + 583505^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221442413394 and 1221442413403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305360603357 + ... + 305360603360.

Almost surely, 2^{1221442413434} is an apocalyptic number.

1221442413434 is a deficient number, since it is larger than the sum of its proper divisors (610721206720).

1221442413434 is an equidigital number, since it uses as much as digits as its factorization.

1221442413434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610721206719.

The product of its digits is 73728, while the sum is 35.

Adding to 1221442413434 its reverse (4343142441221), we get a palindrome (5564584854655).

The spelling of 1221442413434 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, four hundred thirteen thousand, four hundred thirty-four".