1321220435 has 4 divisors (see below), whose sum is σ = 1585464528. Its totient is φ = 1056976344.

The previous prime is 1321220419. The next prime is 1321220443. The reversal of 1321220435 is 5340221231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321220435 - 2⁴ = 1321220419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321220435.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132122039 + ... + 132122048.

It is an arithmetic number, because the mean of its divisors is an integer number (396366132).

Almost surely, 2^1321220435 is an apocalyptic number.

1321220435 is a deficient number, since it is larger than the sum of its proper divisors (264244093).

1321220435 is an equidigital number, since it uses as much as digits as its factorization.

1321220435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264244092.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1321220435 is about 36348.5960526676. The cubic root of 1321220435 is about 1097.2992795755.

Adding to 1321220435 its reverse (5340221231), we get a palindrome (6661441666).

The spelling of 1321220435 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, four hundred thirty-five".