11211221033 has 2 divisors, whose sum is σ = 11211221034. Its totient is φ = 11211221032.

The previous prime is 11211221027. The next prime is 11211221101. The reversal of 11211221033 is 33012211211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11193005209 + 18215824 = 105797^2 + 4268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211221033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11211221023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605610516 + 5605610517.

It is an arithmetic number, because the mean of its divisors is an integer number (5605610517).

Almost surely, 2^11211221033 is an apocalyptic number.

It is an amenable number.

11211221033 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211221033 is an equidigital number, since it uses as much as digits as its factorization.

11211221033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11211221033 its reverse (33012211211), we get a palindrome (44223432244).

The spelling of 11211221033 in words is "eleven billion, two hundred eleven million, two hundred twenty-one thousand, thirty-three".