1231221220033 has 8 divisors (see below), whose sum is σ = 1489881140352. Its totient is φ = 993254093376.

The previous prime is 1231221220013. The next prime is 1231221220043. The reversal of 1231221220033 is 3300221221321.

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 1231221220033 - 2¹⁷ = 1231221088961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231221219986 and 1231221220013.

It is not an unprimeable number, because it can be changed into a prime (1231221220003) 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, 5173198285 + ... + 5173198522.

It is an arithmetic number, because the mean of its divisors is an integer number (186235142544).

Almost surely, 2^{1231221220033} is an apocalyptic number.

It is an amenable number.

1231221220033 is a deficient number, since it is larger than the sum of its proper divisors (258659920319).

1231221220033 is a wasteful number, since it uses less digits than its factorization.

1231221220033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10346396831.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1231221220033 its reverse (3300221221321), we get a palindrome (4531442441354).

The spelling of 1231221220033 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred twenty thousand, thirty-three".