1221220131233 has 8 divisors (see below), whose sum is σ = 1224952426152. Its totient is φ = 1217488478976.

The previous prime is 1221220131199. The next prime is 1221220131251. The reversal of 1221220131233 is 3321310221221.

It can be written as a sum of positive squares in 4 ways, for example, as 102751020304 + 1118469110929 = 320548^2 + 1057577^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221220131233 - 2³⁰ = 1220146389409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221220131199 and 1221220131208.

It is not an unprimeable number, because it can be changed into a prime (1221220131433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3793991 + ... + 4103267.

It is an arithmetic number, because the mean of its divisors is an integer number (153119053269).

Almost surely, 2^{1221220131233} is an apocalyptic number.

It is an amenable number.

1221220131233 is a deficient number, since it is larger than the sum of its proper divisors (3732294919).

1221220131233 is a wasteful number, since it uses less digits than its factorization.

1221220131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321331.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221220131233 its reverse (3321310221221), we get a palindrome (4542530352454).

The spelling of 1221220131233 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, two hundred thirty-three".