21423230053 has 2 divisors, whose sum is σ = 21423230054. Its totient is φ = 21423230052.

The previous prime is 21423229981. The next prime is 21423230063. The reversal of 21423230053 is 35003232412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21375024804 + 48205249 = 146202^2 + 6943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423230053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423230063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711615026 + 10711615027.

It is an arithmetic number, because the mean of its divisors is an integer number (10711615027).

Almost surely, 2^21423230053 is an apocalyptic number.

It is an amenable number.

21423230053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423230053 is an equidigital number, since it uses as much as digits as its factorization.

21423230053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21423230053 its reverse (35003232412), we get a palindrome (56426462465).

The spelling of 21423230053 in words is "twenty-one billion, four hundred twenty-three million, two hundred thirty thousand, fifty-three".