1221320404233 has 12 divisors (see below), whose sum is σ = 1764802581828. Its totient is φ = 813902937120.

The previous prime is 1221320404229. The next prime is 1221320404303. The reversal of 1221320404233 is 3324040231221.

1221320404233 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 3 + 20 + 404 + 233 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1145473591824 + 75846812409 = 1070268^2 + 275403^2 .

It is not a de Polignac number, because 1221320404233 - 2² = 1221320404229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221320404197 and 1221320404206.

It is not an unprimeable number, because it can be changed into a prime (1221320404133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25863910 + ... + 25911087.

It is an arithmetic number, because the mean of its divisors is an integer number (147066881819).

Almost surely, 2^{1221320404233} is an apocalyptic number.

It is an amenable number.

1221320404233 is a deficient number, since it is larger than the sum of its proper divisors (543482177595).

1221320404233 is a wasteful number, since it uses less digits than its factorization.

1221320404233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51777624 (or 51777621 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 1221320404233 its reverse (3324040231221), we get a palindrome (4545360635454).

The spelling of 1221320404233 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, four hundred four thousand, two hundred thirty-three".