1221021143033 has 16 divisors (see below), whose sum is σ = 1235902659600. Its totient is φ = 1206214281216.

The previous prime is 1221021142997. The next prime is 1221021143077. The reversal of 1221021143033 is 3303411201221.

It can be written as a sum of positive squares in 8 ways, for example, as 85833178729 + 1135187964304 = 292973^2 + 1065452^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221021143033 - 2¹⁰ = 1221021142009 is a prime.

It is a super-2 number, since 2×1221021143033² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221021143093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112666091 + ... + 112676927.

It is an arithmetic number, because the mean of its divisors is an integer number (77243916225).

Almost surely, 2^{1221021143033} is an apocalyptic number.

It is an amenable number.

1221021143033 is a deficient number, since it is larger than the sum of its proper divisors (14881516567).

1221021143033 is a wasteful number, since it uses less digits than its factorization.

1221021143033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14156.

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

Adding to 1221021143033 its reverse (3303411201221), we get a palindrome (4524432344254).

The spelling of 1221021143033 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred forty-three thousand, thirty-three".