1221233203313 has 4 divisors (see below), whose sum is σ = 1221298749300. Its totient is φ = 1221167657328.

The previous prime is 1221233203303. The next prime is 1221233203339. The reversal of 1221233203313 is 3133023321221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 280356483169 + 940876720144 = 529487^2 + 969988^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221233203313 - 2¹² = 1221233199217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221233203303) 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, 32745038 + ... + 32782311.

It is an arithmetic number, because the mean of its divisors is an integer number (305324687325).

Almost surely, 2^{1221233203313} is an apocalyptic number.

It is an amenable number.

1221233203313 is a deficient number, since it is larger than the sum of its proper divisors (65545987).

1221233203313 is an equidigital number, since it uses as much as digits as its factorization.

1221233203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65545986.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 1221233203313 its reverse (3133023321221), we get a palindrome (4354256524534).

The spelling of 1221233203313 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred three thousand, three hundred thirteen".