21110233321 has 2 divisors, whose sum is σ = 21110233322. Its totient is φ = 21110233320.

The previous prime is 21110233307. The next prime is 21110233357. The reversal of 21110233321 is 12333201112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19255725225 + 1854508096 = 138765^2 + 43064^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110233321 - 2¹⁷ = 21110102249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110239321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555116660 + 10555116661.

It is an arithmetic number, because the mean of its divisors is an integer number (10555116661).

Almost surely, 2^21110233321 is an apocalyptic number.

It is an amenable number.

21110233321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110233321 is an equidigital number, since it uses as much as digits as its factorization.

21110233321 is an evil number, because the sum of its binary digits is even.

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

Adding to 21110233321 its reverse (12333201112), we get a palindrome (33443434433).

The spelling of 21110233321 in words is "twenty-one billion, one hundred ten million, two hundred thirty-three thousand, three hundred twenty-one".