1211221021033 has 4 divisors (see below), whose sum is σ = 1211223223440. Its totient is φ = 1211218818628.

The previous prime is 1211221021019. The next prime is 1211221021063. The reversal of 1211221021033 is 3301201221121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1211221021033 - 2⁹ = 1211221020521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221021033.

It is not an unprimeable number, because it can be changed into a prime (1211221021063) 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, 493938 + ... + 1632916.

It is an arithmetic number, because the mean of its divisors is an integer number (302805805860).

Almost surely, 2^{1211221021033} is an apocalyptic number.

It is an amenable number.

1211221021033 is a deficient number, since it is larger than the sum of its proper divisors (2202407).

1211221021033 is a wasteful number, since it uses less digits than its factorization.

1211221021033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202406.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1211221021033 its reverse (3301201221121), we get a palindrome (4512422242154).

The spelling of 1211221021033 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, thirty-three".