1221331223233 has 24 divisors (see below), whose sum is σ = 1348108667136. Its totient is φ = 1105627944960.

The previous prime is 1221331223207. The next prime is 1221331223291. The reversal of 1221331223233 is 3323221331221.

It is a happy number.

It is not a de Polignac number, because 1221331223233 - 2⁵ = 1221331223201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221331223633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194259816 + ... + 194266102.

It is an arithmetic number, because the mean of its divisors is an integer number (56171194464).

Almost surely, 2^{1221331223233} is an apocalyptic number.

It is an amenable number.

1221331223233 is a deficient number, since it is larger than the sum of its proper divisors (126777443903).

1221331223233 is a wasteful number, since it uses less digits than its factorization.

1221331223233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12813 (or 12802 counting only the distinct ones).

The product of its digits is 7776, while the sum is 28.

Adding to 1221331223233 its reverse (3323221331221), we get a palindrome (4544552554454).

The spelling of 1221331223233 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred twenty-three thousand, two hundred thirty-three".