21000122233 has 2 divisors, whose sum is σ = 21000122234. Its totient is φ = 21000122232.

The previous prime is 21000122201. The next prime is 21000122251. The reversal of 21000122233 is 33222100012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20623257664 + 376864569 = 143608^2 + 19413^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000122233 - 2⁵ = 21000122201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000122833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500061116 + 10500061117.

It is an arithmetic number, because the mean of its divisors is an integer number (10500061117).

Almost surely, 2^21000122233 is an apocalyptic number.

It is an amenable number.

21000122233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000122233 is an equidigital number, since it uses as much as digits as its factorization.

21000122233 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 16.

Adding to 21000122233 its reverse (33222100012), we get a palindrome (54222222245).

The spelling of 21000122233 in words is "twenty-one billion, one hundred twenty-two thousand, two hundred thirty-three".