1221303303331 has 4 divisors (see below), whose sum is σ = 1222240605712. Its totient is φ = 1220366000952.

The previous prime is 1221303303323. The next prime is 1221303303347. The reversal of 1221303303331 is 1333033031221.

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 1221303303331 - 2³ = 1221303303323 is a prime.

It is a super-2 number, since 2×1221303303331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221303303296 and 1221303303305.

It is not an unprimeable number, because it can be changed into a prime (1221303303361) 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, 468649236 + ... + 468651841.

It is an arithmetic number, because the mean of its divisors is an integer number (305560151428).

Almost surely, 2^{1221303303331} is an apocalyptic number.

1221303303331 is a deficient number, since it is larger than the sum of its proper divisors (937302381).

1221303303331 is an equidigital number, since it uses as much as digits as its factorization.

1221303303331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937302380.

The product of its (nonzero) digits is 2916, while the sum is 25.

Adding to 1221303303331 its reverse (1333033031221), we get a palindrome (2554336334552).

The spelling of 1221303303331 in words is "one trillion, two hundred twenty-one billion, three hundred three million, three hundred three thousand, three hundred thirty-one".