1221320332033 has 4 divisors (see below), whose sum is σ = 1222275235840. Its totient is φ = 1220365428228.

The previous prime is 1221320332031. The next prime is 1221320332147. The reversal of 1221320332033 is 3302330231221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221320332033 - 2¹ = 1221320332031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221320331989 and 1221320332007.

It is not an unprimeable number, because it can be changed into a prime (1221320332031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477449985 + ... + 477452542.

It is an arithmetic number, because the mean of its divisors is an integer number (305568808960).

Almost surely, 2^{1221320332033} is an apocalyptic number.

It is an amenable number.

1221320332033 is a deficient number, since it is larger than the sum of its proper divisors (954903807).

1221320332033 is an equidigital number, since it uses as much as digits as its factorization.

1221320332033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954903806.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 1221320332033 its reverse (3302330231221), we get a palindrome (4523650563254).

The spelling of 1221320332033 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, three hundred thirty-two thousand, thirty-three".