1211033320021 has 4 divisors (see below), whose sum is σ = 1384038080032. Its totient is φ = 1038028560012.

The previous prime is 1211033319959. The next prime is 1211033320031. The reversal of 1211033320021 is 1200233301121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1211033320021 - 2¹¹ = 1211033317973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211033320031) 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, 86502379995 + ... + 86502380008.

It is an arithmetic number, because the mean of its divisors is an integer number (346009520008).

Almost surely, 2^{1211033320021} is an apocalyptic number.

It is an amenable number.

1211033320021 is a deficient number, since it is larger than the sum of its proper divisors (173004760011).

1211033320021 is an equidigital number, since it uses as much as digits as its factorization.

1211033320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173004760010.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1211033320021 its reverse (1200233301121), we get a palindrome (2411266621142).

The spelling of 1211033320021 in words is "one trillion, two hundred eleven billion, thirty-three million, three hundred twenty thousand, twenty-one".