21153324223 has 2 divisors, whose sum is σ = 21153324224. Its totient is φ = 21153324222.

The previous prime is 21153324191. The next prime is 21153324259. The reversal of 21153324223 is 32242335112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21153324223 - 2⁵ = 21153324191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21153324191 and 21153324200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21153328223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576662111 + 10576662112.

It is an arithmetic number, because the mean of its divisors is an integer number (10576662112).

Almost surely, 2^21153324223 is an apocalyptic number.

21153324223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153324223 is an equidigital number, since it uses as much as digits as its factorization.

21153324223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 28.

Adding to 21153324223 its reverse (32242335112), we get a palindrome (53395659335).

The spelling of 21153324223 in words is "twenty-one billion, one hundred fifty-three million, three hundred twenty-four thousand, two hundred twenty-three".