21121002233 has 2 divisors, whose sum is σ = 21121002234. Its totient is φ = 21121002232.

The previous prime is 21121002211. The next prime is 21121002247. The reversal of 21121002233 is 33220012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16592788969 + 4528213264 = 128813^2 + 67292^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121002233 - 2¹⁸ = 21120740089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21121002293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560501116 + 10560501117.

It is an arithmetic number, because the mean of its divisors is an integer number (10560501117).

Almost surely, 2^21121002233 is an apocalyptic number.

It is an amenable number.

21121002233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121002233 is an equidigital number, since it uses as much as digits as its factorization.

21121002233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21121002233 its reverse (33220012112), we get a palindrome (54341014345).

The spelling of 21121002233 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred thirty-three".