1221031332133 has 4 divisors (see below), whose sum is σ = 1221054730668. Its totient is φ = 1221007933600.

The previous prime is 1221031332119. The next prime is 1221031332149. The reversal of 1221031332133 is 3312331301221.

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 788405478084 + 432625854049 = 887922^2 + 657743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221031332133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221031332098 and 1221031332107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221031332233) 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 3 ways as a sum of consecutive naturals, for example, 11620816 + ... + 11725417.

It is an arithmetic number, because the mean of its divisors is an integer number (305263682667).

Almost surely, 2^{1221031332133} is an apocalyptic number.

It is an amenable number.

1221031332133 is a deficient number, since it is larger than the sum of its proper divisors (23398535).

1221031332133 is an equidigital number, since it uses as much as digits as its factorization.

1221031332133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23398534.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221031332133 its reverse (3312331301221), we get a palindrome (4533362633354).

The spelling of 1221031332133 in words is "one trillion, two hundred twenty-one billion, thirty-one million, three hundred thirty-two thousand, one hundred thirty-three".