21230422553 has 2 divisors, whose sum is σ = 21230422554. Its totient is φ = 21230422552.

The previous prime is 21230422547. The next prime is 21230422561. The reversal of 21230422553 is 35522403212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16417809424 + 4812613129 = 128132^2 + 69373^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230422553 - 2⁶ = 21230422489 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230422523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615211276 + 10615211277.

It is an arithmetic number, because the mean of its divisors is an integer number (10615211277).

Almost surely, 2^21230422553 is an apocalyptic number.

It is an amenable number.

21230422553 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230422553 is an equidigital number, since it uses as much as digits as its factorization.

21230422553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21230422553 its reverse (35522403212), we get a palindrome (56752825765).

The spelling of 21230422553 in words is "twenty-one billion, two hundred thirty million, four hundred twenty-two thousand, five hundred fifty-three".