1221220232233 has 4 divisors (see below), whose sum is σ = 1293056716500. Its totient is φ = 1149383747968.

The previous prime is 1221220232213. The next prime is 1221220232291. The reversal of 1221220232233 is 3322320221221.

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 445319986329 + 775900245904 = 667323^2 + 880852^2 .

It is not a de Polignac number, because 1221220232233 - 2⁵ = 1221220232201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221220232198 and 1221220232207.

It is not an unprimeable number, because it can be changed into a prime (1221220232213) 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, 35918242108 + ... + 35918242141.

It is an arithmetic number, because the mean of its divisors is an integer number (323264179125).

Almost surely, 2^{1221220232233} is an apocalyptic number.

It is an amenable number.

1221220232233 is a deficient number, since it is larger than the sum of its proper divisors (71836484267).

1221220232233 is an equidigital number, since it uses as much as digits as its factorization.

1221220232233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71836484266.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 1221220232233 its reverse (3322320221221), we get a palindrome (4543540453454).

The spelling of 1221220232233 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred thirty-two thousand, two hundred thirty-three".